Huge jpg and png files sizes in APhoto

[Gert B]

Dear Affinity staff,

I've encountered a problem that renders Affinity Photo unusable for me at this moment. I found that if I open a JPG and save it again, the file size increases massively.

I did a few tests:

• Original file size = 5.4 mb
• If I open the file and export it as JPG (100%) the file size = 18.4 mb
• If I open the file and export it as PNG the file size = 42.1 mb
• If I open the file, click on 'auto levels' and click on 'save' the file size = 26.2 mb

I've ruined an entire batch of images I collected for a project by correcting levels, contrast and saving them. Is this a bug, or am I doing something wrong?

I'm happy to share the files with you, but somehow the file upload fails. Let me know if you need the files, with instructions how to get them to you.

Best wishes,
Gert

Edited September 27, 2019 by Gert B
typo

[MEB]

Hi Gert B,
Welcome to Affinity Forums
There's a few different methods (and parameters) to generate/write JPG files (this also applies to other formats) thus exporting the file as JPG even at 100% quality (it still compressed despite the 100% value) may lead to increased sizes depending on the method used to originally generate/save the file. Additionally Affinity apps currently don't perform any image optimisations on export - we hope to improve this later. If you are looking to get the best possible quality/size ratio now I advise you to export the file to a non-compressed format (PNG, TIFF etc) and then use a third party image optimiser to reduce their file size - they usually offer quite a few options to generate/optimise the files. Take a look at these for example: ImageOptim (Mac), JPGmini (Mac and Windows), Optimage (Mac), RIOT (Win) etc (some are free).

Do you mind uploading the original JPG using this link for us to take a look if there's something else going on please? Thanks.

[Gert B]

Thank you for your answer and kind suggestions, MEB. I uploaded the files to the dropbox.