PSD compression

D
Posted By
DLPnet
May 17, 2004
Views
1045
Replies
4
Status
Closed
Hello All,

I m developping a software to create PSD files but I would like to compress the images (each layer). For the moment I m using RLE (packbit) compression and everything is working well. But when working with 16 bits I cannot use anymore this compression and I would like also to improve the compression factor.

Anyone knows any other compression scheme that PSD file format supports ? (LZW ? other ?)
And event better do you have an URL with such examples ?

Thanks a lot,

dlp
Related Tags
compression

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BV
Bart van der Wolf
May 17, 2004
"DLPnet" wrote in message
Hello All,

I m developping a software to create PSD files but I would like to compress the images (each layer). For the moment I m using RLE (packbit) compression and everything is working well. But when working with 16 bits I cannot use anymore this compression and I would like also to improve the compression factor.

Just a word of caution; If you try to compress 16-b/ch continuous tone images, there may be little gain and the file may even grow in size. The reason is that there is a reduced chance of recurring bit patterns in those images (esp. film scans) but dictionaries still need to be built.

Anyone knows any other compression scheme that PSD file format supports ? (LZW ? other ?)
And event better do you have an URL with such examples ?

Athough not PSD, you may still benefit from some of the info here: http://www.libtiff.org/
http://home.earthlink.net/~ritter/tiff/

Also not that some forms of compression are not universally supported.

Bart
CC
Chris Cox
May 23, 2004
You will need to get the Photoshop SDK for that information.

Chris

In article <40a88ae6$0$22118$>, DLPnet
wrote:

Hello All,

I m developping a software to create PSD files but I would like to compress the images (each layer). For the moment I m using RLE (packbit) compression and everything is working well. But when working with 16 bits I cannot use anymore this compression and I would like also to improve the compression factor.

Anyone knows any other compression scheme that PSD file format supports ? (LZW ? other ?)
And event better do you have an URL with such examples ?
Thanks a lot,

dlp
D
DLPnet
May 25, 2004
Hello Chris,

I m developping a software to create PSD files but I would like to compress the images (each layer). For the moment I m using RLE (packbit) compression and everything is working well. But when working with 16 bits I cannot use anymore this compression and I would like also to improve the compression factor.

Anyone knows any other compression scheme that PSD file format supports ? (LZW ? other ?)
And event better do you have an URL with such examples ?

You will need to get the Photoshop SDK for that information.

I have it ! Can you tell me where to look for this information. I didn t find anything on this topic.

Thanks a lot,

Dlp
CC
Chris Cox
May 30, 2004
In article <40b36bc0$0$6355$>, DLPnet
wrote:

Hello Chris,

I m developping a software to create PSD files but I would like to compress the images (each layer). For the moment I m using RLE (packbit) compression and everything is working well. But when working with 16 bits I cannot use anymore this compression and I would like also to improve the compression factor.

Anyone knows any other compression scheme that PSD file format supports ? (LZW ? other ?)
And event better do you have an URL with such examples ?

You will need to get the Photoshop SDK for that information.

I have it ! Can you tell me where to look for this information. I didn t find anything on this topic.

That would be in the document on Photoshop file formats. But for Photoshop 7 and later, you have to specifically request the file format documentation.

CHris

MacBook Pro 16” Mockups 🔥

– in 4 materials (clay versions included)

– 12 scenes

– 48 MacBook Pro 16″ mockups

– 6000 x 4500 px

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