Jump to content
You must now use your email address to sign in [click for more info] ×

Search the Community

Showing results for tags 'contrast negate'.

  • Search By Tags

    Type tags separated by commas.
  • Search By Author

Content Type


Forums

  • 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
    • 2.4 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

    End


Last Updated

  • Start

    End


Filter by number of...

Joined

  • Start

    End


Group


Website URL


Location


Interests


Member Title

Found 2 results

  1. By November 2017, dmstraker was asking for information about Contrast Negate (https://forum.affinity.serif.com/index.php?/topic/49811-your-big-friendly-guide-to-layer-blend-modes/&tab=comments#comment-250891) . As I found nothing about this point in more recent posts, I give my opinion. I think that the luminosities of the two layers are analyzed, but in the sense of lumas, i.e. L'=0.3R'+0.59G'+0.11B' where all quantities are normalized quantities varying in the (0,1) interval. First a selection is built of areas where lumas are both below 0.5 ou both above 0.5. Then, the upper layer is replaced with its negative within the selection. I enclose a macro, simu_Contrast_Negate.afmacro which (hopefully) does this job —to be imported in the Macro panel. Select the upper layer and run it. An Invert adjustment should be created above the upper layer (allowing to recover the selection from the adjustment mask) simu_Contrast_Negate.afmacro
  2. Still trying to figure out Contrast Negate. Would love for some kind and clever person to tell me what the algorithm is. Latest nugget: Duplicate layer. Add Curves to bottom layer. Pull left node all the way up and the right node all the way down. You now have the original image. Indeed, if you take an image and just do the curves inversion on it, the result looks like a Contrast Negate. So is it something to do with inverting the luminance?
×
×
  • Create New...

Important Information

Terms of Use | 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.