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Scale3x.py
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Scale3x.py
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#!/usr/bin/env python3
'''
Scale3x aka AdvMAME3x bitmap image scaling using Python only, merged command line and GUI versions.
Created by: Ilya Razmanov (mailto:ilyarazmanov@gmail.com)
aka Ilyich the Toad (mailto:amphisoft@gmail.com)
Usage:
python Scale3x.py source.png result.png - rescales source.png and writes result.png
python Scale3x.py source.png - rescales source.png and overwrites source.png
python Scale3x.py - starts GUI for selecting source and result
Versions:
2024.05.11 Initial release of merged GUI and CLI versions.
2024.05.14 Linked with IncSrc and IncScaleNx version 2024.05.14,
data exchange format changed to incompatible with previous versions.
24.08.01 Complete I/O change, excluding IncSrc in favour of pnglpng.
24.10.01 Internal restructure.
'''
__author__ = 'Ilya Razmanov'
__copyright__ = '(c) 2024 Ilya Razmanov'
__credits__ = 'Ilya Razmanov'
__license__ = 'unlicense'
__version__ = '24.10.01'
__maintainer__ = 'Ilya Razmanov'
__email__ = 'ilyarazmanov@gmail.com'
__status__ = 'Production'
from sys import argv
import pnglpng # PNG-list-PNG joint, uses PyPNG
from scalenx import scale3x # Scale2x and Scale3x from: https://github.com/Dnyarri/PixelArtScaling
def cli(Rez, Dvo):
'''
Command line variant of Scale3x. Input - source and result PNG filenames.
'''
# --------------------------------------------------------------
# Open source file
# Reading image as list
ImageAsListListList = pnglpng.png2list(Rez)[4]
info = pnglpng.png2list(Rez)[5]
# Scaling to 3x image list
EPXImage = scale3x(ImageAsListListList)
# --------------------------------------------------------------
# Fixing resolution to match original print size.
# If no pHYs found in original, 96 ppi is assumed as original value.
if 'physical' in info:
res = info['physical'] # Reading resolution as tuple
x_pixels_per_unit = res[0]
y_pixels_per_unit = res[1]
unit_is_meter = res[2]
else:
x_pixels_per_unit = 3780 # 3780 px/meter = 96 px/inch, 2834 px/meter = 72 px/inch
y_pixels_per_unit = 3780 # 3780 px/meter = 96 px/inch, 2834 px/meter = 72 px/inch
unit_is_meter = True
x_pixels_per_unit = 3 * x_pixels_per_unit # Double resolution to keep print size
y_pixels_per_unit = 3 * y_pixels_per_unit # Double resolution to keep print size
info['physical'] = [x_pixels_per_unit, y_pixels_per_unit, unit_is_meter]
# Resolution changed
# --------------------------------------------------------------
# Explicitly setting compression
info['compression'] = 9
# Writing PNG file
pnglpng.list2png(Dvo, EPXImage, info)
return None # end of CLI variant
# --------------------------------------------------------------
def gui():
'''
GUI variant of Scale3x, based on tkinter.
'''
from pathlib import Path
from tkinter import Label, Tk, filedialog
# --------------------------------------------------------------
# Creating dialog
iconpath = Path(__file__).resolve().parent / '3x.ico'
iconname = str(iconpath)
useicon = iconpath.exists() # Check if icon file really exist. If False, it will not be used later.
sortir = Tk()
sortir.title('Scale3x')
if useicon:
sortir.iconbitmap(iconname) # Replacement for simple sortir.iconbitmap('3xGUI.ico') - ugly but stable.
sortir.geometry('+200+100')
zanyato = Label(sortir, text='Starting...', font=('arial', 14), padx=14, pady=10, justify='center')
zanyato.pack()
sortir.withdraw()
# Main dialog created and hidden
# Open source file
sourcefilename = filedialog.askopenfilename(title='Open PNG file to reScale3x', filetypes=[('PNG', '.png')])
if sourcefilename == '':
sortir.destroy()
quit()
# Updating dialog
sortir.deiconify()
zanyato.config(text=f'Reading {sourcefilename}...')
sortir.update()
sortir.update_idletasks()
# Dialog shown and updated
# Reading image as list
ImageAsListListList = pnglpng.png2list(sourcefilename)[4]
info = pnglpng.png2list(sourcefilename)[5]
# Updating dialog
zanyato.config(text=f'Scaling {sourcefilename}...')
sortir.update()
sortir.update_idletasks()
# Scaling to 3x image list
EPXImage = scale3x(ImageAsListListList)
# --------------------------------------------------------------
# Fixing resolution to match original print size.
# If no pHYs found in original, 96 ppi is assumed as original value.
if 'physical' in info:
res = info['physical'] # Reading resolution as tuple
x_pixels_per_unit = res[0]
y_pixels_per_unit = res[1]
unit_is_meter = res[2]
else:
x_pixels_per_unit = 3780 # 3780 px/meter = 96 px/inch, 2834 px/meter = 72 px/inch
y_pixels_per_unit = 3780 # 3780 px/meter = 96 px/inch, 2834 px/meter = 72 px/inch
unit_is_meter = True
x_pixels_per_unit = 3 * x_pixels_per_unit # Triple resolution to keep print size
y_pixels_per_unit = 3 * y_pixels_per_unit # Triple resolution to keep print size
info['physical'] = [x_pixels_per_unit, y_pixels_per_unit, unit_is_meter]
# Resolution changed
# --------------------------------------------------------------
# Explicitly setting compression
info['compression'] = 9
# Hiding dialog
sortir.withdraw()
# Open export file
resultfilename = filedialog.asksaveasfilename(
title='Save Scale3x PNG file',
filetypes=[('PNG', '.png')],
defaultextension=('PNG file', '.png'),
)
if resultfilename == '':
sortir.destroy()
quit()
# Updating dialog
sortir.deiconify()
zanyato.config(text=f'Saving {resultfilename}...')
sortir.update()
sortir.update_idletasks()
# Writing PNG file
pnglpng.list2png(resultfilename, EPXImage, info)
# Export file written and closed
# Destroying dialog
sortir.destroy()
sortir.mainloop()
return None # end of GUI variant
# --------------------------------------------------------------
if __name__ == '__main__':
# Taking user input
if len(argv) == 2:
Rez = argv[1]
Dvo = argv[1] # will overwrite source file
cli(Rez, Dvo)
elif len(argv) == 3:
Rez = argv[1]
Dvo = argv[2] # will write new file
cli(Rez, Dvo)
else:
gui() # will open GUI