I've broken my exports as JPG somehow

[Ofnuts]

(03-18-2023, 03:11 PM)andrewnewby Wrote: I was playing around with my settings, as I always want JPG's to export at 100% quality

100% serves little purpose. Especially if in the advanced options you are not using 4:4:4 subsampling because you then have binned some of the color information.
But even with full chroma, at 100% quality some complex computations take place and produce round-off errors. Might as well save as PNG then...

(03-18-2023, 03:11 PM)andrewnewby Wrote: (it always seems to want to downgrade to 90%?).

Just click the Save defaults button at the bottom of the dialog to set your current values as the default.

(03-18-2023, 03:11 PM)andrewnewby Wrote: Anyway - now when I export an image as a .jpg I get a corrupted image. Here is my settings:

https://ibb.co/bJht60W

(sorry, I don't seem to be able to embed images via , and the upload attachment doesn't seem to work?)

Anyhow - if I look at the generated .jpg file in Notepad++, I can see it has the right start:

ÿØÿà JFIF

So far this is perfectly normal. Now, if you save the file with NP++ you'll likely break it.

The upload attachment works if your image is under 500K.

(03-18-2023, 03:11 PM)andrewnewby Wrote: So I'm unsure whats going on :/ When I try and open it in Photos I get:

https://ibb.co/4F08ybc

Any suggestions? I've tried to do a "reset" of the settings but that doesn't seem to help :/

Did you try other image viewers (like your browser)? The "progressive" setting (in the Advanced options that you didn't open) is known to break other apps (even though it is only implementing a part of the JPEG standard which is 20 years old...). Since it serves little purpose in modern days (mostly meant to have some of the image display while loading with slow internet connection) I believe it is no longer set by default in the recent versions.  

(03-18-2023, 03:11 PM)andrewnewby Wrote: UPDATE: I just installed 2.99.14 beta, and it showed:

Quote:gimp-user-install: migrating from C:\Users\Andy\AppData\Roaming\GIMP\2.10
Gimp-Config-Message: 15:24:31.556: Error while parsing 'C:\Users\Andy\AppData\Roaming\GIMP\2.99\gimprc' in line 14: invalid value 'convert' for token color-profile-policy
Gimp-Config-Message: 15:24:31.558: There was an error parsing your 'gimprc' file. Default values will be used. A backup of your configuration has been created at 'C:\Users\Andy\AppData\Roaming\GIMP\2.99\gimprc~'.
This is a development version of GIMP.  Debug messages may appear here.

I wonder if that was the issue? It exports fine as a JPG from the beta
TIA

Andy

Possibly the "Progressive" flag that was reset by your re-installation. This said 2.99 isn't recommended for everyday use, in particular it breaks many scripts and plugins. You are better off with 2.10.