Extended properties for JPEG files

[XnTriq]

As of version 2.35, the following fields are available in Edit » Properties » Image:

• Format
• Width
• Height
• Pixels per Inch
• Print Size (inches & centimeters)
• Bits per Plane
• # of Planes
• Bits per Pixel
• Origin
• Colour Model
• Compression
• # of Pages/Frames
• Comment

My request is for additional info on…

• Estimated Compression Level (“Q Factor”)
  • 0 - 100
• Chroma Subsampling
  • 4:4:4
  • 4:4:0
  • 4:2:2
  • 4:2:0
  • 4:1:1
  • 4:1:0
• Mode
  • Baseline Standard
  • Baseline Optimized
  • Progressive
• MCU Block Size
  • 8×8
  • 8×16
  • 16×8
  • 16×16
• Smoothing Factor
  • 0 - 10

[xnview]

• Estimated Compression Level (“Q Factor”): 0 - 100

you have it if Write>Use estimated size is enabled

[*]Chroma Subsampling
[*]Mode

• Baseline Standard
• Baseline Optimized
• Progressive

[*]MCU Block Size
[*]Smoothing Factor: 0 - 10[/list]

ok

[XnTriq]

Thanks for considering, Pierre.

Estimated Compression Level (“Q Factor”): 0 - 100

you have it if Write>Use estimated size is enabled

Right, but because the slider for Quality doesn't jump to the estimated value when Use estimated original quality if possible is activated, users have no way of finding out what the compression ratio of the file is.

p130745.png

BTW: What's the difference between JPEG TrueColor (v1.1) and JPEG TrueColor (v1.2)?

[XnTriq]

BTW: What's the difference between JPEG TrueColor (v1.1) and JPEG TrueColor (v1.2)?

OK, it's the JFIF specification version as specified in the APP0 marker segment.

Shortly thereafter, the group came to the conclusion that the spatial sampling relationship of components specified in JFIF 1.0 was not ideal since it followed digital video conventions rather than those used in common computer formats such as Postscript and QuickTime. They chose to publish another version, JFIF 1.01, which changed that part of the specification to follow the computer format convention. This was deemed to be a minor change since JFIF 1.0 had been circulated for only a short while and decoders which ignored the version number would still render similar images. The Independent JPEG Group (IJG) adopted JFIF version 1.01 for use in its public domain software, which eventually led to millions of images being published in this format. Later in 1992, user feedback led to the final version of JFIF, version 1.02, which supported additional thumbnail formats – most importantly including thumbnails stored in compressed format.