Re: tinting an NSImage
Re: tinting an NSImage
- Subject: Re: tinting an NSImage
- From: "R. Scott Thompson" <email@hidden>
- Date: Mon, 4 Oct 2004 13:32:09 -0500
On Oct 2, 2004, at 4:26 PM, Mark Lilback wrote:
I'm working on a project that needs to take a bitmap image provided by
the user and transform it so that it will print on a printing press
with a single color specified by the user (basically grayscale with an
arbitrary color instead of black).
The Monochrome Image sample code shows how to get a grayscale image,
but I'd need to switch from NSCalibratedWhiteColorSpace to a color
space I create.
I can't find much documentation on NSNamedColorSpace and
NSCustomColorSpace, except the docs for NSDrawBitmap() says that
NSCustomColorSpace says to use the current colorspace of the graphics
context. So I set the colorspace using CGContextSetStrokeColorSpace
and CGContextSetFillColorSpace but then [NSBitmapImageRep
initWithBitmapDataPlanes:...] reports "Bad colorspace name
NSCustomColorSpace".
I've also tried creating a CSImageRef from the monochrome bitmap but
substituting a colorspace create with CGColorSpaceCreateCalibratedGray
using the desired color as the black point. That doesn't work either.
Does anyone know how to use NSCustomColorSpace and/or
NSNamedColorSpace? Or better yet, does anyone have a better idea on
how to switch a grayscale image to use another color as the black
point?
TIA
There's a routine in NSBitmapImageRep called
colorizeByMappingGray:toColor:blackMapping:whiteMapping:. I've never
used it myself... I just ran across it this afternoon. It might do
what you want though.
Scott
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