Determine of a PNG image contains transparent pixels

Forum|Forum|13 years ago
September 19, 2012
4 replies
9892 views

Hi,

I'm exporting lots of PageItems to images using pageItem.export() method. I want the exported image to be a PNG if it contains transparent pixels, otherwise it should be a JPG.

So is there anyway to determine whether an exported PNG contains transparent pixels or not?

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Harbs.

Legend

Umm...

That's all about ActionScript. Nowhere in your post did you indicate that you were using ActionScript. If you had, I might have suggested something similar.

H

Hoang_HuynhAuthor

Known Participant

Sorry Harbs, I just forgot to tell that!

H

Hoang_HuynhAuthor

Known Participant

Hi all,

I just found out some great solutions to this problem, please have a look here http://stackoverflow.com/questions/13568717/check-if-a-png-image-contains-semi-transparent-pixel-using-as3/13570103

L

Laubender

Community Expert

If PhotoShop is available, you could test for alpha through BridgeTalk in opening the png in PhotoShop and running a PhotoShop snippet, returning the result to the InDesign part of the script.

Uwe

C

caseyctg

Known Participant

You might be able to check against a certain alpha channel. Not sure, but might be a decent starting point.

http://jongware.mit.edu/idcs4js/pc_ClippingPathSettings.html