GIMP Version: 2.8.14
Operating System: Windows
GIMP Experience: New User

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My camera saves files in jpg and when I process them in Gimp, I prefer saving them in png format. I set the export type to png for the first save and change filename extension to .png from .jpg, and it exports fine. However, it seems each succeeding export, I have to change each extension to .png even though the export type stays at png. Is there a way to have the extension automatically set to .png?

The "Select file type by extension" would work but it doesn't retain my choice between images.

As far as I am aware you have to put in the file type each time when exporting unless you use the same one quite a lot.
Because your photos are opening up as .jpg's they want to export as .jpg's. I have found they even want to use the same name. (Gotta be careful of overwriting unless you want to)
It will stay the same (save the same each time) if you are creating an image from scratch.
Anyway , if there is a way to do it automatically someone else will let us know.

If you open a jpg, it will want to save as jpg. A tif a tif and a png a png and so forth and so on. Don't think there is a setting for GIMP to save to a default setting (nor do I actually ever need one, but that's just me).

That seems a bit odd. I may have a few hundred files from a trip that will be in jpg format. When I process them, I wish to save in png, so I select the export png option. But for each and every file I export, I have to type a new extension because even though I set the export to png, it doesn't update the extension (and anyway, there's a Overwrite *.jpg if I wanted it to save a jpg.)

One way to overcome this issue is to save all of your jpgs as PNG using a batch processor; Irfanview has such a feature. Then open the PNG from the get-go and save the result (leaving your jpgs intact).

Sounds like you could do with someone writing a GIMP script to take your existing file name, change the extension and export as a .png (in the same directory?)

Kevin

One option, is a script that will export the active image to a png. Not 100% suitable, but works for photographs where there is essentially a single layer, is http://registry.gimp.org/node/18440 export_layers-0.6.py.txt (note the .txt to remove)

snags
- The exported file is named filename.jpg.png which might be an annoyance. I use a home made script the other way; png -> jpeg and a quick rename (lose the extension) of the layer name before using the script tidies this up.
- Come to close the active image and there is the annoying 'save warning' Use the saver plugin http://www.shallowsky.com/software/gimp-save/ which writes the file and marks as 'clean' for a quick close.

Maybe one of the clever people could combine these functions into one. ( see Kevin has suggested that)

Batch conversion. Although good, no need for XnView. BIMP will do that from within Gimp. http://www.alessandrofrancesconi.it/projects/bimp/

Just because I thought it could be done simply, I've created a Python plug-in to export the current image to a PNG.

Extract the .py file from the attached archive and put it into your personal plug-ins folder (also make it executable if you are using a Linux operating system)

It adds an entry on the File menu:


And will save the .png in the same directory as the source image.

Hope it helps

Kevin

Is there a good reason for that? The difference between PNG and good quality JPG (quality 97+, no subsampling) would be less than the chroma noise of your picture and the round-off errors of any color processing in Gimp. If you are that picky with your pictures, you should be working from RAW. The PNG you create are likely bigger that the RAW files from your camera (at least they are with mine, 33MB vs 20MB). And RAW processors never alter your source, they usually keep the processing parameters in a side file.

TL;DR: pixel wise, picture foolish