For any PNG screenshot from a Commodore 64 emulator, it is recommended to fix the colours to have the values as here if they are not so, and then add a gAMA chunk with a value of 45455 (hexadecimal B18F) and an sRGB chunk with rendering intent 1 (relative colorimetric, which is the best for most screenshots), and optionally a cHRM chunk with the values given in the image (multiplied by 100,000).

On a slightly different, but related, note, many C64 games are in a mode that halves the horizontal resolution in order to increase the number of possible colour values per pixel. To find if the game is in this mode, resize (do not resample) the width to 50%, then resize it to 200%. If you end up with the same image you started, add a pHYs chunk with a value of 2 for the width and 1 for the height in the type “unknown unit” (type 0). This notifies that each pixel has an aspect ration of 2 to 1. The image should have a size of 320×200 in both cases.

Portable Network Graphics image, 515 pixels wide, 1738 pixels high, 8 bits per sample, RGB, suggested palette included (name: Commodore 64 VIC-II), 3780 pixels per metre (96 pixels per inch), 1/2.2 (0.45455) gamma, sRGB with relative colorimetric rendering intent. Created with The GIMP 2.2.10, Netpbm 10.27.0 and pngcrush 1.5.10 on Wednesday the 7th of June 2006.

• Image:VIC-II PAL Palette Map-mini.png is a small version (160×192, 4-bit palette).

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