Photon + Portfolio: srcset only returns very small images

[kraftbj]

HTML without Photon:

<img src="https://kraft.im/uploads/2015/01/365brew.jpeg" class="attachment-large size-large wp-post-image" alt="365brew screenshot 1/2015" srcset="https://kraft.im/uploads/2015/01/365brew-400x267.jpeg 400w, https://kraft.im/uploads/2015/01/365brew.jpeg 600w" sizes="(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px" height="400" width="600">

HTML with Photon

<img src="https://i2.wp.com/kraft.im/uploads/2015/01/365brew.jpeg?fit=700%2C700" class="attachment-large size-large wp-post-image" alt="365brew screenshot 1/2015" srcset="https://i2.wp.com/kraft.im/uploads/2015/01/365brew.jpeg?resize=150%2C150 150w, https://i2.wp.com/kraft.im/uploads/2015/01/365brew.jpeg?resize=100%2C100 100w, https://i2.wp.com/kraft.im/uploads/2015/01/365brew.jpeg?resize=50%2C50 50w" sizes="(max-width: 709px) 85vw, (max-width: 909px) 67vw, (max-width: 984px) 61vw, (max-width: 1362px) 45vw, 600px" height="700" width="700">

No Photon:

Photon:

Steps to reproduce:
0. Photon + Custom Content Types active, Portfolio active

1. Create a portfolio post with a smaller feature image. Example:
   
2. Add the [portfolio] shortcode to a page.

Expected: A clear image displayed.
Actual: Blurry image.

A quick look using the above image, Core provides a 300w example (using Twenty Fifteen) while Photon gives a 150w and a 50w. Haven't looked more yet.

[dereksmart]

Where can I see this image live?

Can you provide exact setup (theme) and steps you took to get there (did you upload new image or use an existing one from the media lib).

I can't reproduce it in default 2015, using the same image you provided.
http://dereksmart.wpsandbox.me/portfolio-shortcode/

[kraftbj]

https://kraftbj.wpsandbox.me/port-test/

Theme: Twenty Fifteen
Modules active: Photon, Tiled Galleries, Custom Content Types

I activated portfolio, assigned the image above as the feature image of a new portfolio piece, added the shortcode.

I activated SSO and set you up with an account at https://kraftbj.wpsandbox.me/wp-admin/ so you can poke around there too.

Also can see live at https://kraft.im/about/ (Twenty Sixteen).

[kraftbj]

@dereksmart On your page, I'm not seeing any srcset for the portfolio image. Can you double-check that you're on latest trunk/master? I up/pull both to confirm I'm not seeing anything already fixed and still happening on both my sandbox and my prod site.

[kraftbj]

For the future record, the issue was the way our image_downsize filter handled situations where the requested image size was larger than the full-size of the image. The return included the requested size, not the actual size of the image, which led to Core's srcset processing to be a bit confused.