How to Save 48 Bit TIFF

Targets macOS
1

I’m currently using MonkeyBread TIFF Plugin to handle TIFF images so far I’ve no issues saving 24 Bit TIFF but no clue as to saving TIFF to 48 Bit.

The codes I use are as follows

									texport.Photometric = 2
									texport.SamplesPerPixel = 3
									texport.bitspersample = 16
									call texport.writergb
									call texport.close

The TIFF file still saved as 24 Bits with a Bits Per Sample of 8 instead of 16.

2

WriteRGB only writes 8 bit per sample.

So it overwrites setting with 8 bit per sample and 3 samples per pixel.
If you like to use 16bit, you can of course save your own.

3

or use the 16bit GraphicsMagick classes:
http://monkeybreadsoftware.net/pluginpart-graphicsmagick16.shtml

4

Christian,

I’m trying to keep to the same codebase otherwise there will be a lot of code changes to support 48 Bit.

This is what I have so far, in terms of coming out with an alternative WriteRGB

[code] t.PlanarConfig = 1
t.Photometric = 2
t.SamplesPerPixel = 3
t.BitsPerSample = 16
t.FillOrder = 1
t.Orientation = 1
t.ResolutionUnit = 2
dim current as new picturembs(t.pict.CopyPictureMBS)
t.height = current.height
t.width = current.width

	dim h as integer = current.height-1
	
	for i as integer = 0 to h
			
			t.scanline(i) = current.RowInFormat(i,picturembs.ImageFormatRGB)
	next 
	[/code]

This is my original Picture

and this is the one which came out after using the code above

(In the above, I’ve saved the file as a PNG for this post but the result looks exactly as above).

Is there anything I would need to change in my code ? It did reflect that it is a 48 Bit TIFF, just that the picture seems squashed and the color is off with some color bars on the right.

Thanks.

5

You copy 8bit image data in 16bit image and that won’t work.

Please try GMImage16MBS class.