Drawing engine shows tiles on big images
Posted: Wed May 15, 2013 8:54 am
Take a landscape image @ 22 MPix (for ex. photos from Canon 5D2 or, better, 5DMk3) and display them in Full Screen (by pressing F11). Actually I have the Full Screen mode set up on the 2ndary monitor but I don't think that matters. Display them at 100% and after that at 'zoom to fit'. In both cases (either 100% zoom or zoom to fit), lines in background color appear over the photo giving a tiling effect.
Something like this:
Note: if you cannot see the image, you can download it from here: http://we.tl/Y3AKul1kbe
The phenomenon is tested both in Full Screen mode and in the Preview pane (undocked and enlarged accordingly) with RAW files from Canon 5D Mk3 and Nikon D800, PSD and JPG files. ISTM that it has something to do with image dimensions because for the small images does not appear and for the bigger ones (eg. Nikon D800's images) the lines are thinner. It seems that the phenomenon doesn't appear when the files are in portrait orientation. Most probably (even if I don't know for sure) the drawing engine has a tiled (parallel / multi-threaded?) architecture but there is a misalignment bug when the resulting image is blitted (composed) again.
HTH,
Something like this:
- Drawing bug
- Capture.jpg (249.24 KiB) Viewed 3225 times
The phenomenon is tested both in Full Screen mode and in the Preview pane (undocked and enlarged accordingly) with RAW files from Canon 5D Mk3 and Nikon D800, PSD and JPG files. ISTM that it has something to do with image dimensions because for the small images does not appear and for the bigger ones (eg. Nikon D800's images) the lines are thinner. It seems that the phenomenon doesn't appear when the files are in portrait orientation. Most probably (even if I don't know for sure) the drawing engine has a tiled (parallel / multi-threaded?) architecture but there is a misalignment bug when the resulting image is blitted (composed) again.
HTH,
