Basic understanding of "JPEG Quality"?

[XnTriq]

I used layer blending mode Difference in Photoshop, and increased the contrast with Levels.

Oh, OK. I was guessing Raw Image Analyser or eXclusive OR.

I support this request.

• Softpedia
  • GIPSA-lab: PSNR
  • RGBchannel: PhotoDefiner PSNR Calculator

• Wikipedia
  • Image differencing
  • Blend modes
    • Simple arithmetic blend modes
      • Divide
      • Subtract
      • Difference
    • Boolean arithmetic blend modes
      Corel Photo-Paint: Logical AND/OR/XOR
  • Compositing
    • Matting

• Qt
  • Qt Quarterly: Composition Modes
    “Recent years have seen great improvements in computer graphics hardware, making it possible for developers to add advanced graphical features to applications, such as composition modes and partial transparency, previously only used in specialized graphics applications.”
  • Qt Reference Documentation: Composition Modes Demo
    “Composition Modes demonstrates the range of composition modes available with Qt.”
• SimpelFilter
  • Blending Modes of Photoshop & Co.
    “Blending Modes of Photoshop, Paint Shop Pro and other digital imaging programs with short explanations and the math behind.”
• Kevin Jensen
  • Let’s Learn Math: Photoshop Blend Modes
    “One of the best features of Photoshop is the layer blending modes. They allow you to create spectacular effects with little to no effort. I’ve been taking a closer look into how Photoshop handles the blending of layers (especially the math side of it).”
• Photoshop Essentials
  • Seeing The Difference With JPEG Compression In Photoshop
    “In this Photoshop tutorial, we look at the JPEG file format and how JPEG compression affects the quality of our digital photos and images.”
• Jim Tilander
  • Aurora: Comparing Images
    “In order to automate testing, you often need an image comparison step. This looks at comparing two different HD images.”