Re: changing brightness and contrast in an nsimage
Re: changing brightness and contrast in an nsimage
- Subject: Re: changing brightness and contrast in an nsimage
- From: "John C. Randolph" <email@hidden>
- Date: Fri, 2 Dec 2005 21:34:40 -0800
On Dec 2, 2005, at 9:29 PM, Eric Smith wrote:
I've been going around in circles with this one...
What is a good way to change the brightness and contrast in an
NSImage?
I've been playing with the vImage library for changing contrast,
using the vImageEndsInContrastStretch. This works, but how does
one return the contrast to it's original value? Once you specify
that > 0% of the pixels lie at the histogram extreme, you can't get
the original values back. I know of the ImagApp example showing
how to use CIImage, but using that would require a re-write of
quite a bit of code... I'd rather not go there.
Too bad, because that's how to do it.
-jcr
John C. Randolph <email@hidden> (408) 914-0013
Roaming Cocoa Engineer,
Available for your projects at great Expense and Inconvenience.
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