Search found 12 matches

by tafkaks
2012-10-12T14:53:25-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

It looks like ExtraSamples is not writeable by exiftool
by tafkaks
2012-10-12T11:50:36-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

Unsure -- I'll try when I get a moment and report back
by tafkaks
2012-10-12T09:59:05-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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
by tafkaks
2012-10-12T07:51:53-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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 < FileModif...
by tafkaks
2012-10-11T09:58:09-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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 ...
by tafkaks
2012-10-11T06:36:44-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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 i...
by tafkaks
2012-10-10T19:08:32-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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 see, the ...
by tafkaks
2012-10-10T12:34:35-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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 .
by tafkaks
2012-10-10T12:30:15-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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:
by tafkaks
2012-10-10T12:14:23-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Re: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and

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 occur...
by tafkaks
2012-10-10T09:00:00-07:00
Forum: Users
Topic: no alpha channel after resizing of a tiff file
Replies: 9
Views: 12211

Re: no alpha channel after resizing of a tiff file

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
by tafkaks
2012-10-10T06:53:31-07:00
Forum: Bugs
Topic: Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6
Replies: 22
Views: 38636

Saving a TIFF losing alpha channe; in PhotoShop (CS5 and CS6

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 ...