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kupan787 · Jul 7, 2002, 01:36 PM

I have a pdf file loaded into an NSImage. I then took this pdf and converted it to tiff using:

<blockquote>code:<hr /><pre style="font-size:x-small; font-family: monospace;">data = [myImageToSave TIFFRepresentationUsingCompression:NSTIFFCompressi onNone factor:nil];</pre><hr /></blockquote>Now I am sitting with a NSData object filled with tiff info.

I have looked through the NSImage, and NSBitmapImageRep for anything about converting images, but cant seem to find the info I need.

Anyone with some insight that would be great!

Thanks,
Ben

Wixar · Jul 8, 2002, 04:11 PM

Do you mean black and white, or grayscale? If grayscale is ok, I wrote a function that will do that for you. Let me know if you're interested. Any function that converts to black and white is going to have to use some sort of sophisticated algorithm to get good results and is therefore going to be hard to write; that said, you could do it using Carbon and GWorlds too.

-Peter

kupan787 · Jul 8, 2002, 04:55 PM

<blockquote>quote:<hr />Originally posted by Wixar:
Do you mean black and white, or grayscale? If grayscale is ok, I wrote a function that will do that for you. Let me know if you're interested. Any function that converts to black and white is going to have to use some sort of sophisticated algorithm to get good results and is therefore going to be hard to write; that said, you could do it using Carbon and GWorlds too.

-Peter<hr /></blockquote>Greyscale might work. I need a 1-bit image for this reason, I was told by some people on the Cocoa-Dev list that it is required in order for the function TIFFRepresentationUsingCompression.

They said it is not very well documented, but if you want to use the NSTIFFCompressionCCITTFAX3 compressor, it expects a 1-bit image with no alpha mask.

Pain in the ass if you ask me, but I need it.

Thanks,
Ben