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+--- Thread: PNG data without saving to file? (/Thread-PNG-data-without-saving-to-file)
PNG data without saving to file? - nchen - 09-09-2024
Hello,
Is there a way to convert a layer to PNG data, and convert PNG data to a layer, without exporting to a file?
I am trying to send a layer to a local server that accepts base64 encoded PNG data, receive base64 encoded PNG data, then convert that data back into a layer.
My current process is as follows:
> Save layer as PNG (pdb.gimp_file_save)
> Read the PNG file data
> Convert PNG data to base64 data
> Send base64 data using websocket
> Receive base64 data
> Write the received data to the previously saved PNG file
> Load the PNG file as layer (pdb.gimp_file_load_layer)
> Delete PNG file
The closest solution that I have found is to use PIL/Pillow. I have tried installing PIL6.2.2 and earlier versions with GIMP's python but receive the error:
"The headers or library files could not be found for zlib, a required dependency when compiling Pillow from source."
If there is a solution within GIMP, or someone might be able to help me get Pillow to work, I would greatly appreciate it!
I am on Windows 10, using GIMP 2.10.38, and GIMP's Python 2.7.18. Please let me know if there is additional information I should provide.
Thank you for your time!
RE: PNG data without saving to file? - nchen - 09-10-2024
For context: I'm working on making a plugin that communicates with ComfyUI.
Getting an answer for this would be great, as it would be compatible with existing nodes. I realize, however, that I can just create a new node that accepts GIMP layer data, which I have just done.
RE: PNG data without saving to file? - Ofnuts - 09-10-2024
No, unless you want to rewrite your own plugin.
Using a temporary disk file is not as bad as it looks, because with PNG the encoding is very slow (so you aren't adding that much time with the file I/O in a decent OS).
If you can transfer the raw data (or something close such as BMP or Targa) you can get the layer as a python array using pixel regions.
RE: PNG data without saving to file? - nchen - 09-10-2024
(09-10-2024, 12:19 AM)Ofnuts Wrote: No, unless you want to rewrite your own plugin.
Using a temporary disk file is not as bad as it looks, because with PNG the encoding is very slow (so you aren't adding that much time with the file I/O in a decent OS).
If you can transfer the raw data (or something close such as BMP or Targa) you can get the layer as a python array using pixel regions.
It looks like pixel regions is the best answer. The one issue I find with a temporary file is that it bloats the PF_IMAGE option selection with all of the deleted images.
By the way, your high quality documentation throughout time has been instrumental in my development. Thank you so much!