Interview with Gimp Maintainer

palpatine writes "Linux.com has an interview with Manish Singh (yosh), the chief maintainer of the Gimp project. " Yosh mentions that they are in a feature freeze now (and here is the list of frozen features) for Gimp v1.2. Tons of cool stuff to lust after.

Comments

Color Matching info

[raph]

I'll see if I can fill in some info on the color matching issue.

There are basically two types of color matching that are relevant. The first is Pantone spot colors, and the second is ICC. The latter is generally what you'd use when preparing photos and related images for CMYK offset printing. ICC is gaining ground, and is used as the color matching standard in such emerging technologies as SVG.

Pantone is basically a named collection of colors. The cool thing about Pantone is that you can communicate Pantone colors to professional printers, and they know how to match it. Let's say for example that you're doing a business card, and you want your logo to be in black and a nice deep blue. By specifying Pantone 280, you can be assured that the printers will produce the same nice deep blue that you intended. Incidentally, it's not hard to find a Pantone palette for Gimp if you're skilled at Web searching.

Pantone colors are far less useful when dealing with natural images. The Pantone palette is only a few thousand colors, while the standard for scanned images is sixteen million. These are all the colors between "nice deep blue" and "slightly deeper blue than that". That's where ICC comes in.

ICC basically specifies a transformation from a source color space (say, a calibrated RGB such as sRGB) to a destination color space (say, CMYK values for your particular printing press). In theory, this allows exact color matches between scanned, displayed, and printed images, but in practice things are a lot more complicated because (a) people don't perceive color the same way from an emissive display such as a CRT and reflected color from paper, and (b) not all devices can reproduce the same range of colors. Category (b) is especially tricky because the only way to ensure an exact color match is to use a lowest-common-denominator set of colors. As you can imagine, that's not a good idea. It doesn't look very good. In any case, ICC goes at least partway to solving these things.

Now we get to the patent problem. It appears that Electronics for Imaging has some patents that cover the generic idea of colorimetric matching between scan, display, and print. These patents have recently been upheld in court, so they'd appear to be pretty strong. I don't see a way around them.

As far as I know, these patents only apply in the United States. There is some very interesting development of color management code going on outside the US. Perhaps in 2003, when the most important of the EFI patents expires, this means that color management will be free for all to use.

Hope this clears things up.