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Re: Filter to invert a TIFF image

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Re: Filter to invert a TIFF image

Subject: Re: Filter to invert a TIFF image
From: Todd Yandell <email@hidden>
Date: Fri, 7 Oct 2005 15:14:25 -0500


On Oct 7, 2005, at 6:28 AM, JuanC wrote:

Hi to all !!! Could anybody tell me how build a filter to invert the colours of a -TIFF- file.

The format of the image file doesn't matter. As long as it's a bitmap (i.e. not a PDF), then you can adjust the pixel color values. The easiest way of course, is Core Image. You can also access the pixel values directly using the NSBitmapImageRep class and invert them.

Here's a page describing how to use Core Image: http://developer.apple.com/documentation/GraphicsImaging/Conceptual/ CoreImaging/ci_tasks/chapter_3_section_3.html#//apple_ref/doc/uid/ TP30001185-CH203-BAJDDCEE

If you need to know how to access pixel values in an NSImage, look at the docs NSBitmapImageRep, and search the archives. There have been several discussions on this topic in the past.

Todd
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  >Filter to invert a TIFF image (From: JuanC <email@hidden>)




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