Time delay/hanging

[Leigh Gold]

Generating export ‘hanging’. Although stacking 20x3 minute astrophotography exposures in RAW format using a Canon 600D proceeds without excess delay (8 minutes approx), ‘generating export’ in 16 bit tiff format to IPad Pro photo causes permanent ‘hanging‘. I have waited over 2 hours for a response without success. I have tried various techniques to achieve an export including unticking embed metadata. Please advise.

 

[DM1]

1 hour ago, Leigh Gold said:

I have waited over 2 hours for a response without success.

FWIW In my experience if the iPad screen goes to sleep any image processing by Affinity stops.

[Callum]

Hi Leigh,

Please could you provide some of the sample files so I can try this at my end to see if I get the same behaviour?

Thanks

C 

[Leigh Gold]

I’m trying a different approach and exporting in jpeg. By editing in Affinity, converting to jpeg at 80% and exporting to iOS photos or files for further editing (if required) achieves decent renditions, at least to my eyes. 
What I find inexplicable is how a file size of just 2 stacked images equals the same file size as 20 stacked images (if going by the the recorded file size) as stated on the Affinity post-stacking page after converting all RAW stacked images in TIFF format prior to ‘export’. For instance 2 stacked RAW images = c.72 mgbs and 20 or so = c.69mbs..........2 stacked exports in a seconds, 20 stacked takes longer than 20 light years 😁 with a whole range of export times in between depending on the number of stacked images. 
Upto 7 images or less stacked exports in 20 seconds (I’ve timed it), but as the number of stacked images increases the time taken to export increases exponentially. A graph curve clearly shows such a response. 
The only explanation I can come up with is that the stacked image size actually increases, despite the quoted 68 to72 mbs size. In other words instead of stack AVERAGING (which would explain the 68-72 mbs size) the stack is ADDING, which would explain exponential export tImes (but not the 68 to 72 mbs size.