Legacy ImageMagick Discussions Archive

It looks like ExtraSamples is not writeable by exiftool

Unsure -- I'll try when I get a moment and report back

Ah -- I wonder if just settiing ExtraSamples to 0 would fix this? Any idea how to correct it? There seems to be now way to set this other than tiff:alpha=associated/unassociated

There are differences betweenthe output of exifdata for both, but nothing relating to alpha. Here's a diff between exiftool -verbosr runs for both. Photoshop-saved tiff was on the right hand side (>):

< FileName = Helmet_im.tif
---
> FileName = Helmet_ps.tif
4,6c4,7
< FileSize = 33593666 ...

Right -- but this only seems to happen with tiffs written out by imagemagick. I can use the libtiff tools (tiffcrop, tiffcp, etc) to generate tiffs that do not do this.

Having said all that, my workaround is simple enough -- output my finished image directly to psd. There's no real requirement ...

That may account for the difference. It's possible that libtiff is the culprit here (well, I suspect PS is the *real* culprit). I have also attempted the same operation with other software and gotten the same results. I'll try out the libtiff utilities later and report back.

The data in both files ...

Can you tell me what version of PS you're using? It's definitely missing in mine. Here's the layers panel (channel tab) for the source image:

http://dl.dropbox.com/u/5512/src_layers.png

Here's the same panel for the destination image:

http://dl.dropbox.com/u/5512/dest_layers.png

As you can ...

I can actually see the alpha channel via identify (and gimp) as well. This issue appears to lie with Photoshop only. Unfortunately for me, it's what PS sees that counts .

Platform is OSX 10.7.4.

Rebuilding with both openmp and opencl has no effect:

convert --version
Version: ImageMagick 6.7.9-10 2012-10-10 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC
Features:

Hmmm -- no luck here. I built the latest from source with the same results:

convert --version
Version: ImageMagick 6.7.9-10 2012-10-10 Q16 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2012 ImageMagick Studio LLC
Features: OpenMP OpenCL

EDIT:

I should point out that the problem only ...

Just to add in a "me too", I'm suffering the same issue with photoshop and tiff's written out via IM. Details here:

viewtopic.php?f=3&t=22037

There is a similar topic in Bugs to mine that does not appear to be resolved. Basically, my situation is this:

I have a TIFF image produced by a 3d render (source.tif) which has an alpha channel. The alpha channel shows up in Photoshop and Gimp, and I can see that the file has an alpha channel if I ...