Re: Tiff with mask
Re: Tiff with mask
- Subject: Re: Tiff with mask
- From: Steven Rogers <email@hidden>
- Date: Thu, 21 Feb 2002 13:56:05 -0600
On Sunday, February 17, 2002, at 03:30 PM, Andreas Monitzer wrote:
On Sunday, February 17, 2002, at 10:20 , Mamdouh wrote:
So my question is how do i make tiff4s with masks?
In Photoshop you just have to add an alpha channel and save as tiff.
Works fine, just don't forget to premultiply the alpha afterwards:
tiffutil -lzw in.tiff -out out.tiff
I've been playing with this, and I can't seem to make a TIF that
IconComposer will extract the 128x128 mask from. I made an image in
Photoshop, set the alpha channel, and the 128x128 thumbnail looks
great - transparent in all the right places, but the mask says "No 1 Bit
Mask". What's up with that?
When I use tiffutil to get info on the file I created in photoshop, it
says: Warning: TIFF image with unknown extra samples assumed to have
unassociated alpha. RGB values have been premultiplied Is that a clue
to what I'm doing wrong?
For all the other sizes, you can import the mask directly, but for some
reason, you can't import the mask for the largest icon, it must be
computed from the alpha channel . . . what's up with that?
Any help appreciated - or pointers to documentation where the answer
lies . . .
TIA,
Steve
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