2005.09.08 23:04 "Re: [Tiff] creating JPEG file", by Bob Friesenhahn

I have some image data with the following conditions:

There can be 1 or more tiles for each image.

For each tile, there are 4 planes. Each plane corresponds to the components in the CYMK colour space.

The data for each plane is JPEG encoded.

I just verified that GraphicsMagick 1.2 is able to read and write a

TIFF file conforming to your specification using libtiff 3.7.3. A
sample is attached. I do not expect that many applications will be
able to open this file.

This file was created via the GraphicsMagick incantation:

gm convert infile.jpg -colorspace cmyk -interlace plane -compress jpeg \
-define tiff:tile-geometry=16x16 planar-jpeg.tiff

This is what tiffinfo reports:

% tiffinfo planar-jpeg.tiff
TIFF Directory at offset 0x3e7c
   Image Width: 120 Image Length: 95
   Tile Width: 16 Tile Length: 16
   Bits/Sample: 8
   Sample Format: unsigned integer
   Compression Scheme: JPEG
   Photometric Interpretation: separated
   Ink Set: CMYK
   FillOrder: msb-to-lsb
   YCbCr Subsampling: 2, 2
   Orientation: row 0 top, col 0 lhs
   Samples/Pixel: 4
   Planar Configuration: separate image planes
   White Point: 0.3127-0.329
   DocumentName: planar-jpeg.tiff
   Software: GraphicsMagick 1.2 unreleased Q16 http://www.GraphicsMagick.org/
   PrimaryChromaticities: 0.640000,0.330000,0.300000,0.600000,0.150000,0.060000
   JPEG Tables: (289 bytes)

Bob
======================================
Bob Friesenhahn
bfriesen@simple.dallas.tx.us, http://www.simplesystems.org/users/bfriesen/
GraphicsMagick Maintainer, http://www.GraphicsMagick.org/