Problem or possible bug saving as PNG format w/transparency

LG
Posted By
Loic_Gratton
Jan 16, 2004
Views
665
Replies
3
Status
Closed
I am currently using Photoshop CS on a windows XP box.

I have recently upgraded from PS 5.5

I work alot with PNG files which contain transparency. In PS5.5, all I had to do was to create an alpha channel, then "save a copy" and make sure the "alpha channel" box was checked.

Now in CS, when I attempt to "save as" , when I choose the PNG format, all options disappear. "Copy", "alpha channel" , etc, all boxes become grayed out. I also get a warning that "alpha channel" cannot be checked if it’s not saved as a copy, but the "as a copy" box is not available.

Right now I have a work around, I delete the background of stuff I don’t need, and export to web. This seems to work.

However for functional reasons, I need a full background with an actual alpha channel, so that this alpha channel can get edited without having to go back to the original PSD file.

Any insight on this issue would be appreciated.

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CC
Chris_Cox
Jan 16, 2004
Photoshop 6 and later support real transparency in PNG – not using alpha channels. (this matches the behavior described in the PNG spec.)

Just create a transparent document, and save as PNG.
DW
Daniel_Wang
Jan 18, 2004
After Version 5.5, Photoshop save the PNF file with transparency, not alpha channel. To save an image with alpha channel, try one of the following:
1)Copy the png.8bi from your Photoshop 5.5 folder. Put it to your V6 folder under Photoshop/Plug-Ins/Adobe Photoshop Only/File Formats.

2)Search for a plugin call SuperPNG

Good luck!

Daniel
LG
Loic_Gratton
Jan 19, 2004
Thanks alot for the input guys, it’s very helpful and appreciated!

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