LenC Posted June 18, 2016 Share Posted June 18, 2016 I am trying to apply the directions of the tutorial Channels: Creating/Storing Selections to the file attached*. I wish to replace the whitish strip of sky along the bottom with blue, and am trying to create a mask that matches it. The tutorial file is 16-bit; mine is 8-bit from a JPEG. As in the tutorial, the blue channel has the highest contrast between the sky and the surroundings. I think I understand the Composite RGBA channels but not the Pixel ones. In any case, I created a greyscale image from the Pixel Blue options and then a Flood Select on a clear area of the white sky strip. This selection is crudely what I need, but the silhouetted trees are sometimes selected, sometimes not. The tolerance slider seems to have no effect on the areas selected. Bottom line: What do I do to refine the selection? The selection brush refine option is confusing – something seems to be working after painting and releasing (blue progress line), but then other things happen when I click Apply in the refine options window. The selection has improved, but I don’t understand how. And can any of these refine options help out? * File includes my unfinished selection. I am using AP 1.4.2 under OS 10.11.5. Sunset Waves 2.afphoto Quote AP 1.7.3, MacOS 10.14.6 (usually latest of each, but not going to Catalina until more issues are resolved) Mac Mini, Late 2012, 2.5 GHz Intel Core i5, 8 GB; HD replaced with SSD Link to comment Share on other sites More sharing options...
barninga Posted June 19, 2016 Share Posted June 19, 2016 if you click on a selection tool like the selection brush, then on the refine button that appears above the image, you can use the refine instruments to improve the selection. painting with the matte brush on the edges that need to be refined you should get a nice result. Quote take care, stefano Link to comment Share on other sites More sharing options...
LenC Posted June 20, 2016 Author Share Posted June 20, 2016 Thanks, I have tried that, but results are mixed. After painting (dragging brush) over an area with no selection, a blue progress line appears. I can repeat this. (Is anything happening?) Clicking Apply makes the refine window disappear, and I can see some changes by displaying as a quickmask, but result is disappointing; selection of light area vs. dark trees is incomplete. There are few hints in AP Help as to how changing parameters in the Refine window might help improve the selection. Maybe the tree branches are just too faint for this to work. Quote AP 1.7.3, MacOS 10.14.6 (usually latest of each, but not going to Catalina until more issues are resolved) Mac Mini, Late 2012, 2.5 GHz Intel Core i5, 8 GB; HD replaced with SSD Link to comment Share on other sites More sharing options...
m3photo Posted June 20, 2016 Share Posted June 20, 2016 On a high speed train at the moment, with poor Wifi signal so I can't see your file. The classic suggestion would be copying the image onto another layer, make it black and white and increase the contrast. Then select blacks i.e. the trees and work from there. Quote Link to comment Share on other sites More sharing options...
Madame Posted June 20, 2016 Share Posted June 20, 2016 I can't do anything with your picture. It appears to be painted with red, -so I can't try this out: Filter>colour>erase white paper. Then you can put a blue sky layer underneath. Quote - Affinity Photo 2.3.0 - Affinity Designer 2.3.0 -Affinity Publisher 2.3.0 MacBook Pro 16 GB MacOS Sonoma 14.1.2 Link to comment Share on other sites More sharing options...
LenC Posted June 20, 2016 Author Share Posted June 20, 2016 m3photo: Have tried to create a threshold adjustment layer via menu and icon, but no new layer appears (or change in the grayscale layer). Another frustrating odd behavior by this program. Closed AP and reopened: no change. Maybe reboot is needed. Madame: The red color was because I had used the quickmask (like PS rubylith) option to try to visualize the selection. Pressing Q should return to marquee/ants display. I will try the option you suggested. Quote AP 1.7.3, MacOS 10.14.6 (usually latest of each, but not going to Catalina until more issues are resolved) Mac Mini, Late 2012, 2.5 GHz Intel Core i5, 8 GB; HD replaced with SSD Link to comment Share on other sites More sharing options...
Madame Posted June 20, 2016 Share Posted June 20, 2016 Hi. Yes pressing Q got rid of the mask. Thanks. I don't think erase white paper is doing the trick on this picture. Here's what I did: 1. make a selection of the area you want to adjust with the rectangular marquee tool. 2. Do a command J to get the selection on it's own layer. 3. Add a brightness and contrast adjustment layer to the selection layer 4. Adjust the brightness and contrast until you see the sky get blue. 5.Use a brush (dial the hardness to zero) with black and paint (on the adjustment layer) away the orange/purple colour, but keep the blue. Quote - Affinity Photo 2.3.0 - Affinity Designer 2.3.0 -Affinity Publisher 2.3.0 MacBook Pro 16 GB MacOS Sonoma 14.1.2 Link to comment Share on other sites More sharing options...
evtonic3 Posted June 20, 2016 Share Posted June 20, 2016 I did a blend layers approach. Quote Link to comment Share on other sites More sharing options...
LenC Posted June 20, 2016 Author Share Posted June 20, 2016 Thanks for feedback. Will explore all suggestions this evening and let you know how they work out. m3photo: AP failure to create threshold adjustment layer was solved by rebooting computer. Quote AP 1.7.3, MacOS 10.14.6 (usually latest of each, but not going to Catalina until more issues are resolved) Mac Mini, Late 2012, 2.5 GHz Intel Core i5, 8 GB; HD replaced with SSD Link to comment Share on other sites More sharing options...
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