afx Posted April 18, 2021 Share Posted April 18, 2021 Hi, I am using 1.9.2.1035 on Windows. Sometimes when I start a new stack it is cropped tight other times it is just aligned. I use the "scale, rotate and translate" option. This is how cropped looks (with all layers active): If the crop where usable, I would not worry, but it cuts of important parts. This is how aligned looks (with all layers active): In both cases I used the same settings for the stack creation. So am I missing some setting in the background or is this a bug? thx afx Quote You just have to live and life will give you pictures. – HCB Link to comment Share on other sites More sharing options...
NotMyFault Posted April 18, 2021 Share Posted April 18, 2021 Hi afx, looking at your second screenshot it seems the alignment did not go well, meaning one or more images got mis-aligned. This can happen, especially when you select a stacking method which is incompatible with what is required to actually align the source images, or images do not have enough consistent data points (or the software is too weak) Automatic alignment has its limits. If stacking does not align correctly, you can try to: exclude images which are not aligned, blurry, or otherwise not improving quality, and try to stack again. To identify, selectively hide images in the stack and see when the stacking improves. Pre-process images with too much deviation manually before stacking Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
afx Posted April 18, 2021 Author Share Posted April 18, 2021 21 minutes ago, NotMyFault said: looking at your second screenshot it seems the alignment did not go well, meaning one or more images got mis-aligned. Both results were generated from the same image set with the same options, that what makes it so puzzling. The result is not consistent. The second one is actually what I want as it is perfectly aligned (I am too stupid to hold a camera straight...), the first one is utter rubbish and unusable as Affinity crops away way too much. On the second the alignment is perfect, I just need to clean up the outside mess and provide a common crop afterwards. cheers afx Quote You just have to live and life will give you pictures. – HCB Link to comment Share on other sites More sharing options...
NotMyFault Posted April 18, 2021 Share Posted April 18, 2021 Hi afx, when using handheld shots, the "Persepctive" option may lead to better results. What results do you want to achieve with stacking? The different stacking methods all have some specific intention, and alignment works best if the source images do not differ too much. Some use cases of "New Stack" I'm aware of are: Noise reduction by averaging, to compensate high-iso noise Exposure blending (manual HDR) Analysis of differences in time-lapse images Preparing for other manual steps. What is your specific use case? Regards, Timo Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
afx Posted April 18, 2021 Author Share Posted April 18, 2021 Hi Timo, in this case it is animated GIFs, silly things like yawning or playing dogs. I have done a few so far and perspective never worked, it distorts images. What I absolutely do not understand is why Affinitys behavior is not deterministic. Two stack generations one after the other with completely identical settings deliver different results. This is usually a bug indicator. cheers afx Quote You just have to live and life will give you pictures. – HCB Link to comment Share on other sites More sharing options...
NotMyFault Posted April 19, 2021 Share Posted April 19, 2021 21 hours ago, afx said: What I absolutely do not understand is why Affinitys behavior is not deterministic. Two stack generations one after the other with completely identical settings deliver different results. This is usually a bug indicator. I had this occasionally, too. There are functions in Affinity which intentionally give different results when executed repeatedly, e.g. in-painting, or refine selection. My assumption is that your images shot handheld (with moving objects like dogs) bust the limitation of the algorithms used by Affinity. More "undefined" behavior than bug, as the input is of outside the limits. Only the devs can say definitely. Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
Staff DWright Posted April 19, 2021 Staff Share Posted April 19, 2021 Hi @afx, If it is possible can you please send me a copy of the files that you are using for the stack using the Dropbox link below and I will investigate further https://www.dropbox.com/request/WuJEYF3YLnf60XtfFUdr Quote Link to comment Share on other sites More sharing options...
afx Posted April 25, 2021 Author Share Posted April 25, 2021 On 4/19/2021 at 4:24 PM, DWright said: If it is possible can you please send me a copy of the files that you are using for the stack Hi, sorry for being such a laggard. Here are the files: http://afximages.com/tmp/Set1.zip In the end, they are not worth the trouble, I would cone myself to death with them, but they show the issue nicely. cheers afx Quote You just have to live and life will give you pictures. – HCB Link to comment Share on other sites More sharing options...
NotMyFault Posted April 25, 2021 Share Posted April 25, 2021 Hi afx, all 25 images may be a bit too much different. I got very good stacking results when using the first and the last 8 images, which stay within a reasonable range of perspective variance. On the other side, the middle 8 images are too different. For example the difference between image 63 and 75 is almost extreme (one is 1/4 of the size of the other). I manually blended them. Your expectations to Affinity and stacking might be too high. Quote Mac mini M1 A2348 | Windows 10 - AMD Ryzen 9 5900x - 32 GB RAM - Nvidia GTX 1080 LG34WK950U-W, calibrated to DCI-P3 with LG Calibration Studio / Spider 5 iPad Air Gen 5 (2022) A2589 Special interest into procedural texture filter, edit alpha channel, RGB/16 and RGB/32 color formats, stacking, finding root causes for misbehaving files, finding creative solutions for unsolvable tasks, finding bugs in Apps. My posts focus on technical aspects and leave out most of social grease like „maybe“, „in my opinion“, „I might be wrong“ etc. just add copy/paste all these softeners from this signature to make reading more comfortable for you. Otherwise I’m a fine person which respects you and everyone and wants to be respected. Link to comment Share on other sites More sharing options...
afx Posted April 25, 2021 Author Share Posted April 25, 2021 3 hours ago, NotMyFault said: Hi afx, all 25 images may be a bit too much different. I got very good stacking results when using the first and the last 8 images, which stay within a reasonable range of perspective variance. Hi NotMyFault, yes, you are correct. But that is not the point. In your result you show an outer and an inner frame. I expect the outer frame, but often I get the inner one. Of course, the outer frame would need some cloning work, but it would not cut off essential parts. But depending on the mood of Affinity I sometimes get the outer and sometimes the inner frame with the same image set and settings. cheers afx Quote You just have to live and life will give you pictures. – HCB Link to comment Share on other sites More sharing options...
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