Re: Colorize Image
Stani <[email protected]>
| Newsgroups | gmane.comp.python.image |
|---|---|
| Message-ID | <[email protected]> |
How about using ImageOps.colorize ;-) ? On Thu, Feb 11, 2010 at 12:50 PM, <[email protected]> wrote: > On 10 February 2010 11:01, Espen Moe-Nilssen <[email protected]> wrote: >> We are making an open source project, http://plone.org/products/subskins >> I have been trying over and over again to find a way to let PIL colorize an >> image. >> It should work like this: >> 1) I have a greyscale image >> 2) A color is selected, for example "#123456" >> 3) The image is colorized in this way: >> Whatever was white is still white >> Whatever was black (100%) is now "#123456" >> Whaterver was grey (50%) is now 50% of "#123456" >> I have tried a lot of different approaches, but the colors always come out >> too dark. Is there a way to do this ? > > You need to split the image into luminance (your greyscale image) and > colour (the constant colour you want to apply). > > If you imagine the RGB space as a cube, the neutral axis (all the grey > colours) is a straight line from (0, 0, 0) to (255, 255, 255). What > you want to do is translate that line (ie. keep the angle of the thing > the same, just translate the whole line up/down/left/right/fwd/back) > so that it passes through #123456 instead. Any bits that go over 255 > or under 0 need to be clipped. > > This is easy in CIELAB space, but still OK in RGB. > > John > _______________________________________________ > Image-SIG maillist - [email protected] > http://mail.python.org/mailman/listinfo/image-sig > -- Phatch Photo Batch Processor - http://photobatch.stani.be SPE Python IDE - http://pythonide.stani.be _______________________________________________ Image-SIG maillist - [email protected] http://mail.python.org/mailman/listinfo/image-sig