Legacy ImageMagick Discussions Archive

Hi all, could any point me in the right direction of how to apply similar settings to an image that are available when saving a tiff in Photoshop.

Embed Colour Profile: true
Image Compression: LZM
Pixel Order: Interleaved
Byte Order: Macintosh
Save Image Pyramid: true

I've read a few things about ptif but I don't pretend to understand it. I also think that I need to specify the LZW compression last from what I've read:

convert input.tif -compress lzw output.tif

Any help would be great.

Thanks,
Nik

see the TIF section of http://www.imagemagick.org/script/formats.php for the -define options

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convert image.tif -define ... -define ... etc ... PTIF:result.tif

If you need to add a profile and there is not one in the input, you can see http://www.imagemagick.org/Usage/formats/#profiles for the -profile command. If your input has a profile, then it will likely pass to the output.

Hi Fred,

many thanks for your reply. I wander if you could explain about the Pyramid tiff format. It's my understanding that it creates multiple, smaller versions of the main image file that are saved in the tiff and used for viewing on the web? In Photoshop you simply tick the 'Save Image Pyramid' option, does:

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PTIF:output.tif

do the same thing?

Thanks,
Nik

PTIF: will create a pyramid tiff with different size/resolution levels and tiled to the specification of the appropriate -define. I believe there is only a fixed number of resolution levels create, but do not recall the exact number, it may be 6 levels or it may depend upon how big your tiff file is in dimensions. You will have to create one and see from identify what it tells you.

You will have to check from the libtiff web page what version of libtiff is required and be sure that you are using that in IM.

On unix systems, you can type in a terminal

tiffinfo

and get the version number

Here is an example: see http://en.wikipedia.org/wiki/File:Barns ... tetons.jpg

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convert barns_grand_tetons.jpg PTIF:barns_grand_tetons_ptif.tif

identify barns_grand_tetons_ptif.tif
barns_grand_tetons_ptif.tif[0] TIFF 1600x1195 1600x1195+0+0 8-bit sRGB 7.78MB 0.000u 0:00.000
barns_grand_tetons_ptif.tif[1] TIFF 800x597 800x597+0+0 8-bit sRGB 7.78MB 0.000u 0:00.000
barns_grand_tetons_ptif.tif[2] TIFF 400x298 400x298+0+0 8-bit sRGB 7.78MB 0.000u 0:00.000
barns_grand_tetons_ptif.tif[3] TIFF 200x149 200x149+0+0 8-bit sRGB 7.78MB 0.000u 0:00.000
barns_grand_tetons_ptif.tif[4] TIFF 100x74 100x74+0+0 8-bit sRGB 7.78MB 0.000u 0:00.000
barns_grand_tetons_ptif.tif[5] TIFF 50x37 50x37+0+0 8-bit sRGB 7.78MB 0.000u 0:00.000

Since I did not specify a -define for the tilesize, I think it defaults to 128

To specify it uniquely, you would use

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convert barns_grand_tetons.jpg -define tiff:tile-geometry=128x128 PTIF:barns_grand_tetons_ptif2.tif

Unfortunately, identify -verbose, does not seem to report the tiff tile size.

Anything further, you would need to check the ptif/tif specifications, which I am sure you can find on the web.

Many Thanks Fred.

I must admit it was the -define tiff:tile-geometry=128x128 part that was confusing me the most. I wasn't sure if I needed to specify that part and if so what the correct syntax was.

I'll see what other info I can find about the ptiff format.

Thanks,
Nik

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