APhoto 2 file size not diminishing when resizing

[SP40]

Hi,

Mac OS Ventura 13.0.1 Aff Photo V2 & 2.0.3

I have a 1200dpi 16 bit scan (approx 8000 x 8000px)of a drawing which has been adjusted in Affinity Photo V2. It has an additional pixel layer that has some minimal cloning on it and 4 adjustment layers 2 of which have masks. The size on disk is 573Mb

If I change the bit depth to 8 bit and save to disk the file size increases to 725Mb. If I subsequently change the dpi to 300 with resample selected, (approx 2000 x 2000px),  the saved the file only decreases to 544Mb.

If I then change the image size to 500px x 500px and save to disk the file size is 531Mb. by now the image is visibly very pixelated. 

Is there any way to stop this or is it a bug?

This revealed itself when Aff Publisher 2.0.3 was installed and the document with the original 1200dpi file was embedded in it would crash the programme on opening and I tried to reduce the image size of the linked image.

[walt.farrell]

Try doing a Save As and giving it a new name. Space is not reduced automatically on a normal Save until something like 25% will be recovered.

[SP40]

Hi Walt,

Sorry, I omitted to say that each iteration was a "save as" so new data was written disk each time.

Even so the reduction in image size from 8000 x 8000px to 500 x 500px only reduced the file size from 573Mb to 531Mb.

thanks

[carl123]

Does the snapshot panel show you have a snapshot?

[SP40]

Hi Carl.

"there's the problem" 

There was a snapshot marked background. Once deleted, a "save" did not change the file size, but a "save as" did. Also a "save as" with some layers turned off did.

The file size is now 1.2Mb as i would have expected.

Is a Snapshot created by default?

thanks for the solution.

[carl123]

3 minutes ago, SP40 said:

Is a Snapshot created by default?

Yes, and it's a pain in the bum

[R C-R]

7 hours ago, carl123 said:

Yes, and it's a pain in the bum

But it can be handy if you want to use the Undo Brush Tool to selectively undo pixel-level changes made to the file after opening & editing it.

[PugMug]

I'm guessing there's no option to have it not generate this snapshot?

It's not very optimal having to do a "save as" and give my files a new name after I crop (and rasterize & trim) each image in order to have the proper reduced file size...

[walt.farrell]

11 hours ago, PugMug said:

I'm guessing there's no option to have it not generate this snapshot?

No.