Browser Gamma Correction Test Page

Unlabelled PNGs on HTML Colors

This page was created in order to test the self-consistency of web browsers' gamma correction. In brief, if they gamma-correct HTML colors on non-sRGB systems (which would be proper, according to the HTML 4.01 specification), then they should also gamma-correct unlabelled images in the same way. Alternatively, if they don't gamma-correct HTML colors (which also is allowed in HTML 4.01, unlike in CSS), then they should not gamma-correct unlabelled images, either. In the latter case, however, labelled images (such as PNGs with a gAMA, cHRM, sRGB or iCCP chunk) are unlikely to match the HTML colors across all platforms.

This version of the page uses unlabelled PNG images (i.e., no gamma info) and HTML colors for the backgrounds of the table cells. The images will be distinct from the cell backgrounds if the browser gamma-corrects only the HTML colors on a non-sRGB system (such as most Macs, SGIs and NeXT cubes). Most current browsers are ``lazy'' and ignore gamma correction altogether, however, in which case the edges of the images will be invisible.

ffffff ffffcc ffff99 ffff66 ffff33 ffff00

ffccff ffcccc ffcc99 ffcc66 ffcc33 ffcc00

ff99ff ff99cc ff9999 ff9966 ff9933 ff9900

ff66ff ff66cc ff6699 ff6666 ff6633 ff6600

ff33ff ff33cc ff3399 ff3366 ff3333 ff3300

ff00ff ff00cc ff0099 ff0066 ff0033 ff0000

ccffff ccffcc ccff99 ccff66 ccff33 ccff00

ccccff cccccc cccc99 cccc66 cccc33 cccc00

cc99ff cc99cc cc9999 cc9966 cc9933 cc9900

cc66ff cc66cc cc6699 cc6666 cc6633 cc6600

cc33ff cc33cc cc3399 cc3366 cc3333 cc3300

cc00ff cc00cc cc0099 cc0066 cc0033 cc0000

99ffff 99ffcc 99ff99 99ff66 99ff33 99ff00

99ccff 99cccc 99cc99 99cc66 99cc33 99cc00

9999ff 9999cc 999999 999966 999933 999900

9966ff 9966cc 996699 996666 996633 996600

9933ff 9933cc 993399 993366 993333 993300

9900ff 9900cc 990099 990066 990033 990000

66ffff 66ffcc 66ff99 66ff66 66ff33 66ff00

66ccff 66cccc 66cc99 66cc66 66cc33 66cc00

6699ff 6699cc 669999 669966 669933 669900

6666ff 6666cc 666699 666666 666633 666600

6633ff 6633cc 663399 663366 663333 663300

6600ff 6600cc 660099 660066 660033 660000

33ffff 33ffcc 33ff99 33ff66 33ff33 33ff00

33ccff 33cccc 33cc99 33cc66 33cc33 33cc00

3399ff 3399cc 339999 339966 339933 339900

3366ff 3366cc 336699 336666 336633 336600

3333ff 3333cc 333399 333366 333333 333300

3300ff 3300cc 330099 330066 330033 330000

00ffff 00ffcc 00ff99 00ff66 00ff33 00ff00

00ccff 00cccc 00cc99 00cc66 00cc33 00cc00

0099ff 0099cc 009999 009966 009933 009900

0066ff 0066cc 006699 006666 006633 006600

0033ff 0033cc 003399 003366 003333 003300

0000ff 0000cc 000099 000066 000033 000000

Here are some related PNG pages at this site:

Last modified 21 August 2005.

Copyright © 2000-2005 Greg Roelofs.