Jump to content

Search the Community

Showing results for tags 'afp-2468'.

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


  • Affinity Support
    • News and Information
    • Frequently Asked Questions
    • Affinity Support & Questions
    • Feedback & Suggestions
  • Learn and Share
    • Tutorials (Serif and Customer Created Tutorials)
    • Share your work
    • Resources
  • Bug Reporting
    • V2 Bugs found on macOS
    • V2 Bugs found on Windows
    • V2 Bugs found on iPad
    • Reports of Bugs in Affinity Version 1 applications
  • Beta Software Forums
    • 2.1 New Features and Improvements
    • Other New Bugs and Issues in the Betas
    • Beta Software Program Members Area
    • [ARCHIVE] Reports from earlier Affinity betas

Find results in...

Find results that contain...

Date Created

  • Start


Last Updated

  • Start


Filter by number of...


  • Start




Website URL






Member Title

Found 1 result

  1. I am trying to understand what is going on under the hood when I invert a selection. Situation: I have an image with a selection. The selection consists of two parts, one (at the left hand side) done with the freehand selection tool, the other (to the right) with the elliptical marquee tool. The freehand part has a blurry boundary, the elliptical part has a sharp boundary. I now want to create two layer masks, one from the selection and the other from whatever is outside of it. I use Invert Selection for that. The idea is to stack two layers with the original image, with one of the masks applied to each of them. Hopefully, each mask will let through just enough so that together they will blend into the original image. I expect normal blending mode should do the trick. My way of working is the following: - the original selection I save into a channel that I call "base selection". - I then invert the selection, and save the result in a channel called "base selection inverted". - I create a pixel layer and fill it with pink colour. - I duplicate that layer. - For each of the two layers I create a mask. The "base selection" channel I load into alpha of the first mask, the "base selection inverted" channel into alpha of the second mask. - I stack the two layers with normal blending mode. - I activate both layers and their masks. - Finally, to see clearly what is happening I create an extra blue pixel layer that I use as background. This is the resulting layer panel: I would now expect, perhaps naively, that I would see the original pink image back, since the masks are complementary and both let their own part of the original through. Instead, I see the following: Whereas the elliptical selection to the right is invisible, the blurry freehand selection to the left lets part of the blue background shine through. I now have the following questions: - how exactly is the selection converted into a mask through the channel? As I understand it, a mask is a mapping that tells what opacity to assign to each pixel of the (pixel) layer it is assigned to. White has 100% opacity, black is fully transparant. Fine. For black and white positions in the mask, this works. But if there is a position in the mask with "grey tonal value", an opacity between 0 and 1 is assigned. What is the formula for that? How is this "gray tonal value" determined, and once you have it, how does it translate to an opacity number? - How do the opacity numbers relate between a mask derived from a selection, and a mask derived from its inverse? Are they complementary, i.e., add up to 1 in every case? - From what I am seeing, it looks like inverting a selection does not necessarily lead to masks that are complementary in the sense that they can work together to restore a full image. They may leave spots with less than full opacity, if selections have blurry edges. This leads to the following question: is there a way to achieve what I am aiming for? Or am I missing the obvious here? Thanks to everyone who read through all this. I do hope you can shed some light. For reference, I attach the project (done with AP Jeroen. selection inversion test.afphoto
  • Create New...

Important Information

Please note there is currently a delay in replying to some post. See pinned thread in the Questions forum. These are the Terms of Use you will be asked to agree to if you join the forum. | Privacy Policy | Guidelines | We have placed cookies on your device to help make this website better. You can adjust your cookie settings, otherwise we'll assume you're okay to continue.