Safe texture compression (luanti-org#2808)

Only a single program was used to safely compress all textures in MTG. * `optipng -o7 -zm1-9 -nc -strip all -clobber %%f` The key command used is -nc, which stops color mode changes. I.e. any RGBA textures will remain RGBA textures, with none being changes to 8-bit indexed mode. utils/optimize_textures.sh performs this compression automatically, assuming optipng is installed.
ronoaldo · Feb 21, 2021 · 7b63819 · 7b63819
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diff --git a/menu/header.png b/menu/header.png
diff --git a/mods/beds/textures/beds_bed.png b/mods/beds/textures/beds_bed.png
diff --git a/mods/beds/textures/beds_bed_fancy.png b/mods/beds/textures/beds_bed_fancy.png
diff --git a/mods/beds/textures/beds_bed_foot.png b/mods/beds/textures/beds_bed_foot.png
diff --git a/mods/beds/textures/beds_bed_head.png b/mods/beds/textures/beds_bed_head.png
diff --git a/mods/beds/textures/beds_bed_side1.png b/mods/beds/textures/beds_bed_side1.png
diff --git a/mods/beds/textures/beds_bed_side2.png b/mods/beds/textures/beds_bed_side2.png
diff --git a/mods/beds/textures/beds_bed_side_bottom.png b/mods/beds/textures/beds_bed_side_bottom.png
diff --git a/mods/beds/textures/beds_bed_side_bottom_r.png b/mods/beds/textures/beds_bed_side_bottom_r.png
diff --git a/mods/beds/textures/beds_bed_side_top.png b/mods/beds/textures/beds_bed_side_top.png
diff --git a/mods/beds/textures/beds_bed_side_top_r.png b/mods/beds/textures/beds_bed_side_top_r.png
diff --git a/mods/beds/textures/beds_bed_top1.png b/mods/beds/textures/beds_bed_top1.png
diff --git a/mods/beds/textures/beds_bed_top2.png b/mods/beds/textures/beds_bed_top2.png
diff --git a/mods/beds/textures/beds_bed_top_bottom.png b/mods/beds/textures/beds_bed_top_bottom.png
diff --git a/mods/beds/textures/beds_bed_top_top.png b/mods/beds/textures/beds_bed_top_top.png
diff --git a/mods/beds/textures/beds_bed_under.png b/mods/beds/textures/beds_bed_under.png
diff --git a/mods/beds/textures/beds_transparent.png b/mods/beds/textures/beds_transparent.png
diff --git a/mods/bones/textures/bones_bottom.png b/mods/bones/textures/bones_bottom.png
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diff --git a/mods/bones/textures/bones_rear.png b/mods/bones/textures/bones_rear.png
diff --git a/mods/bones/textures/bones_side.png b/mods/bones/textures/bones_side.png
diff --git a/mods/bones/textures/bones_top.png b/mods/bones/textures/bones_top.png
diff --git a/mods/carts/textures/carts_cart.png b/mods/carts/textures/carts_cart.png
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diff --git a/mods/carts/textures/carts_cart_side.png b/mods/carts/textures/carts_cart_side.png
diff --git a/mods/carts/textures/carts_cart_top.png b/mods/carts/textures/carts_cart_top.png
diff --git a/mods/carts/textures/carts_rail_crossing.png b/mods/carts/textures/carts_rail_crossing.png
diff --git a/mods/carts/textures/carts_rail_crossing_brk.png b/mods/carts/textures/carts_rail_crossing_brk.png
diff --git a/mods/carts/textures/carts_rail_crossing_pwr.png b/mods/carts/textures/carts_rail_crossing_pwr.png
diff --git a/mods/carts/textures/carts_rail_curved.png b/mods/carts/textures/carts_rail_curved.png
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diff --git a/mods/carts/textures/carts_rail_straight.png b/mods/carts/textures/carts_rail_straight.png
diff --git a/mods/carts/textures/carts_rail_straight_brk.png b/mods/carts/textures/carts_rail_straight_brk.png
diff --git a/mods/carts/textures/carts_rail_straight_pwr.png b/mods/carts/textures/carts_rail_straight_pwr.png
diff --git a/mods/carts/textures/carts_rail_t_junction.png b/mods/carts/textures/carts_rail_t_junction.png
diff --git a/mods/carts/textures/carts_rail_t_junction_brk.png b/mods/carts/textures/carts_rail_t_junction_brk.png
diff --git a/mods/carts/textures/carts_rail_t_junction_pwr.png b/mods/carts/textures/carts_rail_t_junction_pwr.png
diff --git a/mods/creative/textures/creative_clear_icon.png b/mods/creative/textures/creative_clear_icon.png
diff --git a/mods/creative/textures/creative_next_icon.png b/mods/creative/textures/creative_next_icon.png
diff --git a/mods/creative/textures/creative_prev_icon.png b/mods/creative/textures/creative_prev_icon.png
diff --git a/mods/creative/textures/creative_search_icon.png b/mods/creative/textures/creative_search_icon.png
diff --git a/mods/creative/textures/creative_trash_icon.png b/mods/creative/textures/creative_trash_icon.png
diff --git a/mods/default/textures/default_acacia_bush_stem.png b/mods/default/textures/default_acacia_bush_stem.png
diff --git a/mods/default/textures/default_acacia_leaves.png b/mods/default/textures/default_acacia_leaves.png
diff --git a/mods/default/textures/default_acacia_leaves_simple.png b/mods/default/textures/default_acacia_leaves_simple.png
diff --git a/mods/default/textures/default_acacia_sapling.png b/mods/default/textures/default_acacia_sapling.png
diff --git a/mods/default/textures/default_acacia_tree.png b/mods/default/textures/default_acacia_tree.png
diff --git a/mods/default/textures/default_acacia_tree_top.png b/mods/default/textures/default_acacia_tree_top.png
diff --git a/mods/default/textures/default_acacia_wood.png b/mods/default/textures/default_acacia_wood.png
diff --git a/mods/default/textures/default_aspen_leaves.png b/mods/default/textures/default_aspen_leaves.png
diff --git a/mods/default/textures/default_aspen_sapling.png b/mods/default/textures/default_aspen_sapling.png
diff --git a/mods/default/textures/default_aspen_tree.png b/mods/default/textures/default_aspen_tree.png
diff --git a/mods/default/textures/default_aspen_tree_top.png b/mods/default/textures/default_aspen_tree_top.png
diff --git a/mods/default/textures/default_aspen_wood.png b/mods/default/textures/default_aspen_wood.png
diff --git a/mods/default/textures/default_blueberry_bush_leaves.png b/mods/default/textures/default_blueberry_bush_leaves.png
diff --git a/mods/default/textures/default_blueberry_bush_sapling.png b/mods/default/textures/default_blueberry_bush_sapling.png
diff --git a/mods/default/textures/default_blueberry_overlay.png b/mods/default/textures/default_blueberry_overlay.png
diff --git a/mods/default/textures/default_bookshelf.png b/mods/default/textures/default_bookshelf.png
diff --git a/mods/default/textures/default_bookshelf_slot.png b/mods/default/textures/default_bookshelf_slot.png
diff --git a/mods/default/textures/default_brick.png b/mods/default/textures/default_brick.png
diff --git a/mods/default/textures/default_bronze_block.png b/mods/default/textures/default_bronze_block.png
diff --git a/mods/default/textures/default_bush_stem.png b/mods/default/textures/default_bush_stem.png
diff --git a/mods/default/textures/default_cactus_side.png b/mods/default/textures/default_cactus_side.png
diff --git a/mods/default/textures/default_chest_front.png b/mods/default/textures/default_chest_front.png
diff --git a/mods/default/textures/default_chest_inside.png b/mods/default/textures/default_chest_inside.png
diff --git a/mods/default/textures/default_chest_lock.png b/mods/default/textures/default_chest_lock.png
diff --git a/mods/default/textures/default_chest_top.png b/mods/default/textures/default_chest_top.png
diff --git a/mods/default/textures/default_coal_block.png b/mods/default/textures/default_coal_block.png
diff --git a/mods/default/textures/default_coniferous_litter.png b/mods/default/textures/default_coniferous_litter.png
diff --git a/mods/default/textures/default_coniferous_litter_side.png b/mods/default/textures/default_coniferous_litter_side.png
diff --git a/mods/default/textures/default_copper_block.png b/mods/default/textures/default_copper_block.png
diff --git a/mods/default/textures/default_coral_brown.png b/mods/default/textures/default_coral_brown.png
diff --git a/mods/default/textures/default_coral_cyan.png b/mods/default/textures/default_coral_cyan.png
diff --git a/mods/default/textures/default_coral_green.png b/mods/default/textures/default_coral_green.png
diff --git a/mods/default/textures/default_coral_orange.png b/mods/default/textures/default_coral_orange.png
diff --git a/mods/default/textures/default_coral_pink.png b/mods/default/textures/default_coral_pink.png
diff --git a/mods/default/textures/default_coral_skeleton.png b/mods/default/textures/default_coral_skeleton.png
diff --git a/mods/default/textures/default_desert_sand.png b/mods/default/textures/default_desert_sand.png
diff --git a/mods/default/textures/default_desert_sandstone.png b/mods/default/textures/default_desert_sandstone.png
diff --git a/mods/default/textures/default_desert_sandstone_block.png b/mods/default/textures/default_desert_sandstone_block.png
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diff --git a/mods/default/textures/default_desert_stone_block.png b/mods/default/textures/default_desert_stone_block.png
diff --git a/mods/default/textures/default_desert_stone_brick.png b/mods/default/textures/default_desert_stone_brick.png
diff --git a/mods/default/textures/default_dirt.png b/mods/default/textures/default_dirt.png
diff --git a/mods/default/textures/default_dry_grass.png b/mods/default/textures/default_dry_grass.png
diff --git a/mods/default/textures/default_dry_grass_1.png b/mods/default/textures/default_dry_grass_1.png
diff --git a/mods/default/textures/default_dry_grass_2.png b/mods/default/textures/default_dry_grass_2.png
diff --git a/mods/default/textures/default_dry_grass_3.png b/mods/default/textures/default_dry_grass_3.png
diff --git a/mods/default/textures/default_dry_grass_4.png b/mods/default/textures/default_dry_grass_4.png
diff --git a/mods/default/textures/default_dry_grass_5.png b/mods/default/textures/default_dry_grass_5.png
diff --git a/mods/default/textures/default_dry_grass_side.png b/mods/default/textures/default_dry_grass_side.png
diff --git a/mods/default/textures/default_fence_acacia_wood.png b/mods/default/textures/default_fence_acacia_wood.png
diff --git a/mods/default/textures/default_fence_aspen_wood.png b/mods/default/textures/default_fence_aspen_wood.png
diff --git a/mods/default/textures/default_fence_junglewood.png b/mods/default/textures/default_fence_junglewood.png
diff --git a/mods/default/textures/default_fence_pine_wood.png b/mods/default/textures/default_fence_pine_wood.png
diff --git a/mods/default/textures/default_fence_rail_acacia_wood.png b/mods/default/textures/default_fence_rail_acacia_wood.png
diff --git a/mods/default/textures/default_fence_rail_aspen_wood.png b/mods/default/textures/default_fence_rail_aspen_wood.png
diff --git a/mods/default/textures/default_fence_rail_junglewood.png b/mods/default/textures/default_fence_rail_junglewood.png
diff --git a/mods/default/textures/default_fence_rail_pine_wood.png b/mods/default/textures/default_fence_rail_pine_wood.png
diff --git a/mods/default/textures/default_fence_rail_wood.png b/mods/default/textures/default_fence_rail_wood.png
diff --git a/mods/default/textures/default_fence_wood.png b/mods/default/textures/default_fence_wood.png
diff --git a/mods/default/textures/default_flint.png b/mods/default/textures/default_flint.png
diff --git a/mods/default/textures/default_footprint.png b/mods/default/textures/default_footprint.png
diff --git a/mods/default/textures/default_furnace_bottom.png b/mods/default/textures/default_furnace_bottom.png
diff --git a/mods/default/textures/default_furnace_fire_fg.png b/mods/default/textures/default_furnace_fire_fg.png
diff --git a/mods/default/textures/default_furnace_front.png b/mods/default/textures/default_furnace_front.png
diff --git a/mods/default/textures/default_furnace_front_active.png b/mods/default/textures/default_furnace_front_active.png
diff --git a/mods/default/textures/default_furnace_top.png b/mods/default/textures/default_furnace_top.png
diff --git a/mods/default/textures/default_glass_detail.png b/mods/default/textures/default_glass_detail.png
diff --git a/mods/default/textures/default_grass_1.png b/mods/default/textures/default_grass_1.png
diff --git a/mods/default/textures/default_grass_2.png b/mods/default/textures/default_grass_2.png
diff --git a/mods/default/textures/default_grass_3.png b/mods/default/textures/default_grass_3.png
diff --git a/mods/default/textures/default_grass_4.png b/mods/default/textures/default_grass_4.png
diff --git a/mods/default/textures/default_grass_5.png b/mods/default/textures/default_grass_5.png
diff --git a/mods/default/textures/default_grass_side.png b/mods/default/textures/default_grass_side.png
diff --git a/mods/default/textures/default_gravel.png b/mods/default/textures/default_gravel.png
diff --git a/mods/default/textures/default_ice.png b/mods/default/textures/default_ice.png
diff --git a/mods/default/textures/default_item_smoke.png b/mods/default/textures/default_item_smoke.png
diff --git a/mods/default/textures/default_jungleleaves.png b/mods/default/textures/default_jungleleaves.png
diff --git a/mods/default/textures/default_jungleleaves_simple.png b/mods/default/textures/default_jungleleaves_simple.png
diff --git a/mods/default/textures/default_jungletree.png b/mods/default/textures/default_jungletree.png
diff --git a/mods/default/textures/default_jungletree_top.png b/mods/default/textures/default_jungletree_top.png
diff --git a/mods/default/textures/default_junglewood.png b/mods/default/textures/default_junglewood.png
diff --git a/mods/default/textures/default_kelp.png b/mods/default/textures/default_kelp.png
diff --git a/mods/default/textures/default_key.png b/mods/default/textures/default_key.png
diff --git a/mods/default/textures/default_key_skeleton.png b/mods/default/textures/default_key_skeleton.png
diff --git a/mods/default/textures/default_ladder_steel.png b/mods/default/textures/default_ladder_steel.png
diff --git a/mods/default/textures/default_ladder_wood.png b/mods/default/textures/default_ladder_wood.png
diff --git a/mods/default/textures/default_large_cactus_seedling.png b/mods/default/textures/default_large_cactus_seedling.png
diff --git a/mods/default/textures/default_lava.png b/mods/default/textures/default_lava.png
diff --git a/mods/default/textures/default_lava_flowing_animated.png b/mods/default/textures/default_lava_flowing_animated.png
diff --git a/mods/default/textures/default_lava_source_animated.png b/mods/default/textures/default_lava_source_animated.png
diff --git a/mods/default/textures/default_leaves.png b/mods/default/textures/default_leaves.png
diff --git a/mods/default/textures/default_leaves_simple.png b/mods/default/textures/default_leaves_simple.png
diff --git a/mods/default/textures/default_marram_grass_1.png b/mods/default/textures/default_marram_grass_1.png
diff --git a/mods/default/textures/default_marram_grass_2.png b/mods/default/textures/default_marram_grass_2.png
diff --git a/mods/default/textures/default_marram_grass_3.png b/mods/default/textures/default_marram_grass_3.png
diff --git a/mods/default/textures/default_mese_block.png b/mods/default/textures/default_mese_block.png
diff --git a/mods/default/textures/default_mese_post_light_side.png b/mods/default/textures/default_mese_post_light_side.png
diff --git a/mods/default/textures/default_mese_post_light_side_dark.png b/mods/default/textures/default_mese_post_light_side_dark.png
diff --git a/mods/default/textures/default_meselamp.png b/mods/default/textures/default_meselamp.png
diff --git a/mods/default/textures/default_mineral_diamond.png b/mods/default/textures/default_mineral_diamond.png
diff --git a/mods/default/textures/default_mineral_iron.png b/mods/default/textures/default_mineral_iron.png
diff --git a/mods/default/textures/default_mineral_mese.png b/mods/default/textures/default_mineral_mese.png
diff --git a/mods/default/textures/default_moss.png b/mods/default/textures/default_moss.png
diff --git a/mods/default/textures/default_moss_side.png b/mods/default/textures/default_moss_side.png
diff --git a/mods/default/textures/default_mossycobble.png b/mods/default/textures/default_mossycobble.png
diff --git a/mods/default/textures/default_obsidian.png b/mods/default/textures/default_obsidian.png
diff --git a/mods/default/textures/default_obsidian_block.png b/mods/default/textures/default_obsidian_block.png
diff --git a/mods/default/textures/default_obsidian_brick.png b/mods/default/textures/default_obsidian_brick.png
diff --git a/mods/default/textures/default_obsidian_glass_detail.png b/mods/default/textures/default_obsidian_glass_detail.png
diff --git a/mods/default/textures/default_papyrus.png b/mods/default/textures/default_papyrus.png
diff --git a/mods/default/textures/default_pine_bush_stem.png b/mods/default/textures/default_pine_bush_stem.png
diff --git a/mods/default/textures/default_pine_needles.png b/mods/default/textures/default_pine_needles.png
diff --git a/mods/default/textures/default_pine_tree_top.png b/mods/default/textures/default_pine_tree_top.png
diff --git a/mods/default/textures/default_pine_wood.png b/mods/default/textures/default_pine_wood.png
diff --git a/mods/default/textures/default_rainforest_litter_side.png b/mods/default/textures/default_rainforest_litter_side.png
diff --git a/mods/default/textures/default_river_water_flowing_animated.png b/mods/default/textures/default_river_water_flowing_animated.png
diff --git a/mods/default/textures/default_sandstone_block.png b/mods/default/textures/default_sandstone_block.png
diff --git a/mods/default/textures/default_sandstone_brick.png b/mods/default/textures/default_sandstone_brick.png
diff --git a/mods/default/textures/default_sign_steel.png b/mods/default/textures/default_sign_steel.png
diff --git a/mods/default/textures/default_sign_wall_steel.png b/mods/default/textures/default_sign_wall_steel.png
diff --git a/mods/default/textures/default_sign_wall_wood.png b/mods/default/textures/default_sign_wall_wood.png
diff --git a/mods/default/textures/default_sign_wood.png b/mods/default/textures/default_sign_wood.png
diff --git a/mods/default/textures/default_silver_sand.png b/mods/default/textures/default_silver_sand.png
diff --git a/mods/default/textures/default_silver_sandstone.png b/mods/default/textures/default_silver_sandstone.png
diff --git a/mods/default/textures/default_silver_sandstone_block.png b/mods/default/textures/default_silver_sandstone_block.png
diff --git a/mods/default/textures/default_silver_sandstone_brick.png b/mods/default/textures/default_silver_sandstone_brick.png
diff --git a/mods/default/textures/default_snow.png b/mods/default/textures/default_snow.png
diff --git a/mods/default/textures/default_snow_side.png b/mods/default/textures/default_snow_side.png
diff --git a/mods/default/textures/default_snowball.png b/mods/default/textures/default_snowball.png
diff --git a/mods/default/textures/default_steel_block.png b/mods/default/textures/default_steel_block.png
diff --git a/mods/default/textures/default_stone.png b/mods/default/textures/default_stone.png
diff --git a/mods/default/textures/default_stone_block.png b/mods/default/textures/default_stone_block.png
diff --git a/mods/default/textures/default_stone_brick.png b/mods/default/textures/default_stone_brick.png
diff --git a/mods/default/textures/default_stones.png b/mods/default/textures/default_stones.png
diff --git a/mods/default/textures/default_tin_block.png b/mods/default/textures/default_tin_block.png
diff --git a/mods/default/textures/default_tool_diamondpick.png b/mods/default/textures/default_tool_diamondpick.png
diff --git a/mods/default/textures/default_torch_on_ceiling_animated.png b/mods/default/textures/default_torch_on_ceiling_animated.png
diff --git a/mods/default/textures/default_tree.png b/mods/default/textures/default_tree.png
diff --git a/mods/default/textures/default_tree_top.png b/mods/default/textures/default_tree_top.png
diff --git a/mods/default/textures/gui_formbg.png b/mods/default/textures/gui_formbg.png
diff --git a/mods/doors/textures/doors_door_glass.png b/mods/doors/textures/doors_door_glass.png
diff --git a/mods/doors/textures/doors_door_obsidian_glass.png b/mods/doors/textures/doors_door_obsidian_glass.png
diff --git a/mods/doors/textures/doors_door_steel.png b/mods/doors/textures/doors_door_steel.png
diff --git a/mods/doors/textures/doors_door_wood.png b/mods/doors/textures/doors_door_wood.png
diff --git a/mods/doors/textures/doors_item_glass.png b/mods/doors/textures/doors_item_glass.png
diff --git a/mods/doors/textures/doors_item_obsidian_glass.png b/mods/doors/textures/doors_item_obsidian_glass.png
diff --git a/mods/farming/textures/farming_bread.png b/mods/farming/textures/farming_bread.png
diff --git a/mods/farming/textures/farming_cotton_5.png b/mods/farming/textures/farming_cotton_5.png
diff --git a/mods/farming/textures/farming_cotton_7.png b/mods/farming/textures/farming_cotton_7.png
diff --git a/mods/farming/textures/farming_cotton_8.png b/mods/farming/textures/farming_cotton_8.png
diff --git a/mods/farming/textures/farming_cotton_wild.png b/mods/farming/textures/farming_cotton_wild.png
diff --git a/mods/farming/textures/farming_soil.png b/mods/farming/textures/farming_soil.png
diff --git a/mods/farming/textures/farming_soil_wet.png b/mods/farming/textures/farming_soil_wet.png
diff --git a/mods/farming/textures/farming_wheat.png b/mods/farming/textures/farming_wheat.png
diff --git a/mods/farming/textures/farming_wheat_3.png b/mods/farming/textures/farming_wheat_3.png
diff --git a/mods/farming/textures/farming_wheat_4.png b/mods/farming/textures/farming_wheat_4.png
diff --git a/mods/farming/textures/farming_wheat_5.png b/mods/farming/textures/farming_wheat_5.png
diff --git a/mods/farming/textures/farming_wheat_7.png b/mods/farming/textures/farming_wheat_7.png
diff --git a/mods/fireflies/textures/fireflies_bottle_animated.png b/mods/fireflies/textures/fireflies_bottle_animated.png
diff --git a/mods/flowers/textures/flowers_chrysanthemum_green.png b/mods/flowers/textures/flowers_chrysanthemum_green.png
diff --git a/mods/flowers/textures/flowers_waterlily.png b/mods/flowers/textures/flowers_waterlily.png
diff --git a/mods/sfinv/textures/sfinv_crafting_arrow.png b/mods/sfinv/textures/sfinv_crafting_arrow.png
diff --git a/mods/stairs/textures/stairs_obsidian_glass_outer_stairside.png b/mods/stairs/textures/stairs_obsidian_glass_outer_stairside.png
diff --git a/mods/stairs/textures/stairs_obsidian_glass_stairside.png b/mods/stairs/textures/stairs_obsidian_glass_stairside.png
diff --git a/mods/tnt/textures/tnt_blast.png b/mods/tnt/textures/tnt_blast.png
diff --git a/mods/tnt/textures/tnt_gunpowder_burning_crossing_animated.png b/mods/tnt/textures/tnt_gunpowder_burning_crossing_animated.png
diff --git a/mods/tnt/textures/tnt_gunpowder_burning_curved_animated.png b/mods/tnt/textures/tnt_gunpowder_burning_curved_animated.png
diff --git a/mods/tnt/textures/tnt_gunpowder_burning_straight_animated.png b/mods/tnt/textures/tnt_gunpowder_burning_straight_animated.png
diff --git a/mods/tnt/textures/tnt_gunpowder_burning_t_junction_animated.png b/mods/tnt/textures/tnt_gunpowder_burning_t_junction_animated.png
diff --git a/mods/tnt/textures/tnt_gunpowder_crossing.png b/mods/tnt/textures/tnt_gunpowder_crossing.png
diff --git a/mods/tnt/textures/tnt_gunpowder_curved.png b/mods/tnt/textures/tnt_gunpowder_curved.png
diff --git a/mods/tnt/textures/tnt_gunpowder_straight.png b/mods/tnt/textures/tnt_gunpowder_straight.png
diff --git a/mods/tnt/textures/tnt_gunpowder_t_junction.png b/mods/tnt/textures/tnt_gunpowder_t_junction.png
diff --git a/mods/tnt/textures/tnt_smoke.png b/mods/tnt/textures/tnt_smoke.png
diff --git a/mods/vessels/textures/vessels_drinking_glass.png b/mods/vessels/textures/vessels_drinking_glass.png
diff --git a/mods/vessels/textures/vessels_drinking_glass_inv.png b/mods/vessels/textures/vessels_drinking_glass_inv.png
diff --git a/mods/vessels/textures/vessels_glass_bottle.png b/mods/vessels/textures/vessels_glass_bottle.png
diff --git a/mods/vessels/textures/vessels_glass_fragments.png b/mods/vessels/textures/vessels_glass_fragments.png
diff --git a/mods/vessels/textures/vessels_shelf_slot.png b/mods/vessels/textures/vessels_shelf_slot.png
diff --git a/mods/vessels/textures/vessels_steel_bottle.png b/mods/vessels/textures/vessels_steel_bottle.png
diff --git a/mods/xpanes/textures/xpanes_door_steel_bar.png b/mods/xpanes/textures/xpanes_door_steel_bar.png
diff --git a/mods/xpanes/textures/xpanes_item_steel_bar.png b/mods/xpanes/textures/xpanes_item_steel_bar.png
diff --git a/mods/xpanes/textures/xpanes_trapdoor_steel_bar.png b/mods/xpanes/textures/xpanes_trapdoor_steel_bar.png
diff --git a/screenshot.png b/screenshot.png
diff --git a/utils/optimize_textures.sh b/utils/optimize_textures.sh
@@ -0,0 +1,6 @@
+#!/bin/bash
+
+# Colors with 0 alpha need to be preserved, because opaque leaves ignore alpha.
+# For that purpose, the use of indexed colors is disabled (-nc).
+
+find -name '../*.png' -print0 | xargs -0 optipng -o7 -zm1-9 -nc -strip all -clobber