PNG uncompressed become compressed....over 3000 files, help me!!

[ALPHA3]

Hi,

I'm on creative cloud with lastest photoshop.

I've been having an issue with PNG compression.

I exported 3000 images, they are uncompressed PNG, loseless. (100% sure of this)

If I open any of them to make a color correction, once I click save I got to wait over 30 sec.

So this look like my 'uncompressed' PNG become 'compressed PNG once photoshop has done some editing.

Is there a trick to skip the PNG to use compression ?

This don't really make sence to change the image compression without asking...

thanks

[Derek Cross]

Have a look at: File > Scripts > Image Processor.

[ALPHA3]

what do you mean ?

[ALPHA3]

Try this.:

Save a PNG as 'uncompressed'. Close it.

Open it and make some changes inside this file. Click save.

Did you see the difference ?

You should have to wait for compression to save the file.

[JJMack]

Test you theory.  Open one of you png files you worked on and saved that you believe has been compressed.  Then use menu File>Save AS.  Use the file type pull-down  select PNG and save.  If it exist stop change the file name to  File Name Copy and save.  In the save option make sure compression is not set. Does save take thirty seconds are the two png files sizes the same or different.

[ALPHA3]

But if you 'choose' to overwrite' the file

What do you got ?

[ALPHA3]

So you're saying ' I need to make 'save as copy' to avoid Photoshop to make a compressed version of my uncompressed file ?

[JJMack]

That is what I wrote not to do. If save as gives you the message file exist I said stop change the name to NameCopy and save a new copy you know is not compressed for you made sure compress was NOT set in the save option so  you can check your new uncompress png copy to the png you work on and feel has been compressed. TO verify the you were right the png was compressed.

[ALPHA3]

ok. I'll check that.

thanks Mack