Talk:Color Cell Compression

Almost complete rewrite of article

I've completely rewritten this article and explained the CCC algorithm in detail. The article probably still needs a good amount of editing and cleanup though, as it's only a draft.

Jdbtwo (talk) 21:52, 28 July 2016 (UTC)

What was new about this?

What's the difference between this 1986 technique described in this article and the Attribute clash codec used in the ZX Spectrum (1982), other than that Color Cell Compression divides the image into 4x4 (not 8x8) pixel blocks in step 1 and uses an adaptive 8-bit palette rather than a fixed 4-bit RGBI palette in step 7? --Damian Yerrick (talk) 14:00, 24 September 2017 (UTC)

There's nothing new about using a bitmap to partition a block of pixels into two colors. What's novel in Color Cell Compression is that the pixels are partitioned according to the average luminance of the pixels in the block. Also, two representative colors are selected from the mean of each partition of the colors in the block after which they're replaced by indices into a pallete that is derived from the entire uncompressed image. The indices are selected so that the colors to which they point are the best representation in the palette for the two representative colors. Jdbtwo (talk) 17:29, 26 September 2017 (UTC)

Thanks for clarifying the inventive step. So I guess k does mean clustering after all. --Damian Yerrick (talk) 00:04, 21 October 2017 (UTC)

A Commons file used on this page has been nominated for speedy deletion

The following Wikimedia Commons file used on this page has been nominated for speedy deletion:

• Lena-ccc-wikipedia-rgb555.png

You can see the reason for deletion at the file description page linked above. —Community Tech bot (talk) 03:52, 1 September 2019 (UTC)

A Commons file used on this page has been nominated for speedy deletion

The following Wikimedia Commons file used on this page has been nominated for speedy deletion:

• Ccc-wikipedia-lena-1.png

You can see the reason for deletion at the file description page linked above. —Community Tech bot (talk) 16:52, 1 September 2019 (UTC)

"Mandrill" test images

Since these files haven't been flagged or removed from the WikiMedia Commons, and no one has complained, I'll include them again. The USC SIPI standard test image database doesn't list any copyright information for the image, but says that possibly Kodak could hold a copyright, although they're not sure. As it is now, this image has been used across the Web with no copyright complaints from Kodak, as far as I know. Jdbtwo (talk) 16:29, 13 October 2019 (UTC)