TIFFRepresentation giving me a tiff WITH an alpha
TIFFRepresentation giving me a tiff WITH an alpha
- Subject: TIFFRepresentation giving me a tiff WITH an alpha
- From: Ben Mackin <email@hidden>
- Date: Wed, 13 Nov 2002 17:29:30 -0800
If I do the following:
myPDFasData = [[NSData alloc] initWithContentsOfFile:[filesArray
objectAtIndex:fileNum]];
myPDF = [[NSPDFImageRep alloc] initWith
Data:myPDFasData];
[myPDF setCurrentPage:newDocPages];
image1 = [[NSImage alloc] init];
[image1 addRepresentation:myPDF];
data = [image1 TIFFRepresentation];
[data writeToFile:@"/here.tif" atomically:YES];
here.tif has an alpha channel, which I do not want.
If I create the tiff file myself (by converting the pdf to tif in preview),
the tif is generated with no alpha channel. So what I need to do now is
figure out how to get my tif file to be generated with no alpha (as it
shouldn't have one).
If I do the following, it seems to just ignore the alpha cannel, so I get an
image with no alpha, but it doesn't look correct (anywhere that should be
white has been filled in black for example):
NSBitmapImageRep *tempImagRep;
[myPDF setCurrentPage:newDocPages];
image1 = [[NSImage alloc] init];
[image1 addRepresentation:myPDF];
tempImagRep = [[NSBitmapImageRep alloc]
initWithBitmapDataPlanes:NULL
pixelsWide:[image1 size].width
pixelsHigh:[image1 size].height
bitsPerSample:8
samplesPerPixel:3
hasAlpha:NO
isPlanar:NO
colorSpaceName:NSCalibratedRGBColorSpace
bytesPerRow:0
bitsPerPixel:0];
[tempImagRep setSize:[image1 size]];
NSImage *myImage2 = [[NSImage alloc] initWithSize:NSMakeSize([image1
size].width, [image1 size].height)];
[myImage2 addRepresentation:tempImagRep];
[myImage2 lockFocusOnRepresentation:tempImagRep];
[image1 compositeToPoint:NSMakePoint(0, 0) operation:
NSCompositeSourceAtop];
[myImage2 unlockFocus];
data = [myImage2
TIFFRepresentationUsingCompression:NSTIFFCompressionPackBits factor:0.0];
[data writeToFile:@"/here.tif" atomically:YES];
So if anyone has some thoughts on this one, please fire away.
Thanks,
Ben
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