Mark_A Posted September 8, 2015 Share Posted September 8, 2015 Working with Affinity Photo version 1.3.5 to straighten a horizon, for some reason the results aren't good. I can't recall if the previous version was ok for this. I've attached a couple of sample images. This is happening with different images (e.g. the 'Mermaid' sample image) and on different machines and with different degrees of rotation. Mark Quote Link to comment Share on other sites More sharing options...
Staff Callum Posted September 8, 2015 Staff Share Posted September 8, 2015 Hi Mark, Welcome to the Forums :) The tool will straighten the picture to match whatever line you draw. The tool is working fine for me on your images. Which part of the image is it that you are trying to get straight? I have managed to get the boat to look straight however it won't be possible to get the blue rope also straight without directly editing the picture. C Quote Please tag me using @ in your reply so I can be sure to respond ASAP. Link to comment Share on other sites More sharing options...
Mark_A Posted September 8, 2015 Author Share Posted September 8, 2015 Thanks! No problem in straightening it, but looking at the blocky stuff in the resulting rotated image. Ok, rotation's going to lead to interpolation of pixels, but AP seems to be dealing with this in blocks - particularly noticeable in the line and on the black line on the side of the ship, but generally chewing the image throughout Mark Quote Link to comment Share on other sites More sharing options...
manu schwendener Posted September 8, 2015 Share Posted September 8, 2015 Funny: I wanted to add another example (see attachment). When I first wanted to straight that picture I gave up and used the mesh warp tool instead (result http://www.panoramio.com/photo/121475550). But now I realized: the broken lines are only visible _in_ AP; once I export the file the lines are smooth again. Maybe this also happened in post 1? As I can't really see "blocky stuff" in the second picture - or a mermaid, for that matter ;) Quote manuschwendener.ch Link to comment Share on other sites More sharing options...
Mark_A Posted September 9, 2015 Author Share Posted September 9, 2015 Thanks for pinning that down. So ... exported files are fine and my attached samples do not show the problem. Yours does though and viewed in AP, it's persistent - save the project and reopen it and in APs viewer, the blockiness persists, here's a screenshot rather than the exported file. (Still no mermaid, sorry). Having filed a bug on it, it's because in the preferences, I had view quality set to 'Nearest Neighbour (fastest)' rather than 'Bilinear (best quality)'. AP's plenty quick enough with the latter even though it's running on a 2009-era mac here. manu schwendener 1 Quote Link to comment Share on other sites More sharing options...
manu schwendener Posted September 9, 2015 Share Posted September 9, 2015 > Yours does though Yes: it's a screenshot of the picture _in_ AP after rotating it. > it's because in the preferences, I had view quality set to 'Nearest Neighbour (fastest)' rather than 'Bilinear (best> quality)'. Oh!!! Thank you for getting that cleared up! What did you set for Dither gradients and Use precise clipping: check or leave unchecked? Quote manuschwendener.ch Link to comment Share on other sites More sharing options...
Staff MEB Posted September 9, 2015 Staff Share Posted September 9, 2015 Hi manuschwendener.ch - Dither gradients will slow down the system a little but will improve gradients rendering/look reducing banding. I always have it checked. - Precise clipping - usually doesn't affect much the quality of what you see on screen (except in very specific cases), and can slow down the system considerably in certain circumstances. Better to leave this one off. MattP gave a great explanation of all performance settings here. Take a look for more info. Quote A Guide to Learning Affinity Software | Affinity Quick Reference Link to comment Share on other sites More sharing options...
manu schwendener Posted September 9, 2015 Share Posted September 9, 2015 Thanks a lot :-) Quote manuschwendener.ch Link to comment Share on other sites More sharing options...
MarkusM Posted October 12, 2015 Share Posted October 12, 2015 The effect is only on screen. I noticed the image is recalculated when exporting. Quote Link to comment Share on other sites More sharing options...
manu schwendener Posted October 12, 2015 Share Posted October 12, 2015 Yes - but you can change your preferences so it also looks ok before exporting, see post #6. Quote manuschwendener.ch Link to comment Share on other sites More sharing options...
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