On Friday, September 26, 2008, at 09:04AM, "Christian Klotz" <[EMAIL PROTECTED]> wrote:
>I'm trying to scan an image for existence of a given color. So I was >wondering what the most performing way is to achieve this goal. You probably want to look into direct-pixel access (there are some code examples out there that show you how) >Basically I want to find out which amount of the given color that >image has. >Furthermore, are there ways to find all regions of the image having >the color? So it would be easy to show the user which parts of the >image are matching. Sounds like Photoshop's feature of showing "non-NTSC" colors. I would create a secondary bit-map image. I would then read the first one and for each pixel that matches your criteria, I would add a pixel to the secondary image of a certain color. Such a color could be in a user-preference. I think Photoshop defaults to bright red. Then, when rendering your image, you can optionally composite the secondary image to show the matching pixels. Important: your matching logic should take color spaces into account when comparing values. This actually gets a bit tricky. You may also choose to define a certain amount of "slop" when comparing actual RGB, HSB, CMYK, etc. values. -- Rick Sharp Instant Interactive(tm) _______________________________________________ Cocoa-dev mailing list (Cocoa-dev@lists.apple.com) Please do not post admin requests or moderator comments to the list. Contact the moderators at cocoa-dev-admins(at)lists.apple.com Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/cocoa-dev/archive%40mail-archive.com This email sent to [EMAIL PROTECTED]
