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Re: CIAffineTransform blurs images

On Feb 10, 2007, at 11:19 PM, John C. Randolph wrote: 

On Feb 8, 2007, at 4:25 PM, Roland Torres wrote:

I'm using QC & Cocoa to process digitized video at tiny scales, 2x2, 4x4, 8x8, 16x16, for a computer vision system. I need to enlarge the tiny images on the screen to 800x800, so that each pixel, now displayed as a block, can be clearly seen and examined. I'm trying to use CIAffineTransform to do this, but it seems to have the unfortunate side effect of blurring the image so much that the individual pixel "blocks" can no longer be seen. Instead, it's a large, blurry blob.

Is there a way to enlarge tiny images, with CIAffineTransform or other filters, without the blurring?

send -setImageInterpolation:NSImageInterpolationNone to the graphics context in which you're drawing.

Hmm. Adding this call in numerous places doesn't seem to make a difference. Is there a certain time or location the call should be issued?

Roland

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References: 
 >CIAffineTransform blurs images (From: Roland Torres <email@hidden>)
 >Re: CIAffineTransform blurs images (From: "John C. Randolph" <email@hidden>)



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