 PNG transparency - How can I determine if it's set? |
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| PNG transparency - How can I determine if it's set? |
| Guest_Al Savage_* |
 Dec 6 2004, 10:48 PM
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#1
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Guests  |
I have a collection of PNG files. Some were apparently saved with the "Write Transparency Chunk" turned on. Example:
http://falconfaq/Bendix_22BD/Bendix_22BD_01.html The greenish background bleeds through, which in the case of this particular image, is undesireable. Is there a method, using PMV, to determine which of several hundred PNGs are in this condition, and if so, is there a batch method to turn transparency off for these images (ie re-save them with that option disabled)? TIA, Al S. |
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Dec 8 2004, 10:52 AM
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#2
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 Forum Member Group: Admin Posts: 672 Joined: 14-March 00 From: Wilmington, North Carolina Member No.: 3 |
Since PNG is lossless, you can safely do a batch conversion to a different directory for all those files.
Peter -------------------- Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
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Dec 8 2004, 11:50 PM
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#3
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 Forum Member Group: Members Posts: 100 Joined: 6-August 00 From: Duvall, Washington USA Member No.: 28 |
Yes, that is a solution to this particular situation (batch converting a few thousand files in order to turn off transparency, and in the process losing the valuable-to-me timestamp for each file), but you haven't answered my question.
How do I use PMV to determine the current state of the transparency? Regards, Al S. -------------------- |
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Dec 12 2004, 09:42 PM
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#4
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Forum Member Group: Admin Posts: 672 Joined: 14-March 00 From: Wilmington, North Carolina Member No.: 3 |
You can't use PMView to determine the current state of the transparency; currently it does not show the flags.
You need a developer's PNG utility that will show you the option flags. (Hint: look for "dumppng" or "pngdump"). Thanks, Edited By Peter on 1102905885 -------------------- Peter Nielsen (peter@pmview.com) "If you can dream it, you can do it" JFK.
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