Browser Gamma Correction Test Page

Gamma-labelled PNGs (1/1.6) 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, including the ones on this page) are unlikely to match the HTML colors across all platforms.

This version of the page uses PNG images labelled with gamma 1/1.6 (i.e., 0.625) and HTML colors for the backgrounds of the table cells. The images will be distinct from the cell backgrounds if the browser fails to gamma-correct both the PNGs and the HTML colors, and the system is sRGB (such as most Windows- and Unix-based PCs); or if it gamma-corrects only one of the two on a non-sRGB system (such as most Macs, SGIs and NeXT cubes). If the browser gamma-corrects both (and does so correctly!), the edges of the images will be invisible on all systems. This will also be the case on sRGB systems if the browser gamma-corrects only the PNGs, however (as in Mozilla versions through M17).

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Here are some related PNG pages at this site:

• Browser Gamma-Consistency test page
  • Unlabelled GIFs on HTML Colors ("control group") or CSS colors
  • Unlabelled PNGs on HTML Colors or CSS colors
  • Gamma-labelled PNGs (1/1.6) on HTML colors or CSS colors
  • Gamma-labelled PNGs (1/2.2) on HTML colors or CSS colors
  • sRGB-labelled PNGs (1/2.2) on HTML colors or CSS colors
  • ICC-profile-labelled PNGs (1/1.0) on HTML colors or CSS colors

• PNG home page
• Complete PNG Site Map

Copyright © 2000-2005 Greg Roelofs.