PNGThermal

[KarMa]

Found a cool little program that will create a heatmap of any png image, showing how well each pixel has been compressed. The heatmap created will change depending on the compressor used and settings used, even if both images are losslessly the same. For Windows it's CLI only.

http://encode.ru/threads/1725-pngthermal-pseudo-thermal-view-of-PNG-compression-efficiency

Example


Might be easier to look at them in a new tab or download them.
https://forum.videohelp.com/attachments/36101-1457690789/orig.png
https://forum.videohelp.com/attachments/36102-1457690829/output.png

- midnight blue = strictly less than a bit
- dark blue = strictly less than 2 bits
- royal blue = strictly less than 3 bits
- teal = strictly less than 4 bits
- emerald green = strictly less than 5 bits
- chartreuse = strictly less than 6 bits
- yellow = strictly less than 7 bits
- orange = strictly less than 8 bits
- bright red = strictly less than 9 bits
- darker red tones are used the same way for 10, 11, 12... bits

[Baldrick]

Looks interesting. But your example images doesn't work...upload again...or are they same as the russian site?

[KarMa]

Looks interesting. But your example images doesn't work...upload again...or are they same as the russian site?

It looked fine in FF but looks like Chrome could not see it. I tried uploading the image in attachments and then hotlinking to it, instead of just clicking the "Upload Image" button and uploading it that way.

Thanks for pointing it out.