Output File Size Incorrect

[BC15]

I am processing 16 bit tif files in Affinity Photo and after flattening exporting them to another folder as 8 bit files. The 16 bit files are 114mb and the 8 bit files output are of course usually 57mb as you would expect. Except that is when I have used the crop feature to remove part of the image from the bottom of the picture or extend the image in some way, leaving an unfilled area of the image which I then fill in using the clone tool. The crop parameters are set the same as the original image. I then make any layer adjustments such as curves and levels and flatten the image under the Documents menu tab as I do with all the images, before exporting them.

The output looks fine and viewing the properties show that it is identical to the original size as defined in pixels (5472 x 3648), except that the actual size is now 76.2 mb, instead of 57 mb. This size is the same for all the 8 bit files that have been adjusted in this way - and of the amount of adjustment in the crop was different each time. The reason I spotted this was that when I used Canons DPP 4 software to batch output the 8 bit images to another folder (to generate the missing EXIF thumbnail - see a different thread on this subject), it will neither display or process these images. Maybe I'm doing something wrong here or maybe there is a problem with Affinity, but any help would be appreciated.

[walt.farrell]

Have you perhaps chosen the Export option to save Affinity Layers? If so, deselect that option and see if you get the behavior you want.

[BC15]

Hi Walt - No this box is always unticked......

[BC15]

If I open the 8 bit image in Photoshop it appears as 'Layer 0'. If I go to save it as it is it asks 'Do you want to include layers'. If I flatten the image in Photoshop and then save it it is saved as the correct size (57 mb). It would appear that for some reasom Affinity is saving it with a layer, although the image has been flattened.

In Affinity I then tried just moving the crop box to include empty space above the image and roughly filled it. I did not add any adjustment layers, so there were no layers to flatten. When exported it was 76.2 mb. The only conclusion I can draw is that Affinity is creating and 'invisible' layer and saving it regardless, increasing the file size.

[R C-R]

I don't know if this has anything to do with it, but in the Affinity 1.7.x apps we now have a choice when exporting to TIFF of using LZW, Zip, or no compression. There is also an option in Preferences > General to save thumbnails with documents (but that might apply only to native format files, not to exports).

Anyway, you might want to do a few tests with these different options to see if that makes any difference.

[BC15]

R C_R - Thanks for the suggestion, but I require uncompressed Tif files and this works fine with all other images. It's looking increasingly like a bug in Affinity, so I'll have to report it.

[R C-R]

2 hours ago, BC15 said:

It's looking increasingly like a bug in Affinity, so I'll have to report it.

Make sure that you include in your report that you are using the uncompressed option. That might be important in helping them reproduce the bug (if there is one).