Software·43,940 discussions

Layers in PNG?

Tags: Software

Hello everyone

I have some questions regarding PNG.

1) Is a PNG picture one layer and a background OR only one layer with background and everything merged together?

I have opened one of my PNG-files using TweakPNG.
2) If there is no tRNS chunk in the display window of TweakPNG, and the bit depth of the PNG-file is 24, is it then correct, that there is no transparency in the picture?

3)I there is no BKGD chunk in the display window of TweakPNG, is it then correct, that there is no background in the picture?
And that the picture is only one layer?

This has been my primary souce of information: https://www.w3.org/TR/2003/REC-PNG-20031110/

What does this mean:
A) “The more opaque a pixel,the more it hides the background against which the image is presented”.
B) 3.1.13 composite (verb) to form an imageby merging a foreground image and a background image, using transparency information to determine where and to what extent the background should be visible. The foreground image is said to be “composited against” the background.

Thanks in advance for answering

Best regards
Emil

Topic

PNG

In reply to Layers in PNG?

If you export in PNG format, all layers are rasterized. This format isn’t vectorial and doesn’t support layers. Only Adobe Fireworks (Dismissed) can save .png with all layer but are readable only by itself. Check if Paint.net can read .psd format (photoshop native) with all his layers.

[Author]

Replies