• Members 976 posts
    June 30, 2023, 5:11 p.m.

    Here is how it looks (Photoshop as the analysis tool, magic wand, tolerance set to zero, anti-aliasing off, contiguous on, 44,600 pixels of the same value):
    Screenshot from 2023-06-30 12-47-40.png

    Screenshot from 2023-06-30 12-47-40.png

    PNG, 431.4 KB, uploaded by IliahBorg on June 30, 2023.

  • Members 533 posts
    July 1, 2023, 4:56 p.m.

    OK; I give up. What is it?

  • Members 976 posts
    July 1, 2023, 5:02 p.m.

    Just an example of a poor edit to get "vivid red", maybe due to clipping in a raw converter too. I was trying to show a trivial check for posterization.

  • Removed user
    July 1, 2023, 8:43 p.m.

    Wow - remind me to continue editing at 32-bit floating point Linear RGB in the GIMP ...

  • Members 2303 posts
    July 1, 2023, 9:37 p.m.

    w510 (2023_06_27 06_41_46 UTC).jpg

    w510 (2023_06_27 06_41_46 UTC).jpg

    JPG, 3.1 MB, uploaded by DonaldB on July 1, 2023.

  • Members 2303 posts
    July 1, 2023, 9:39 p.m.

    single shot em5mk2

  • Members 976 posts
    July 2, 2023, 12:31 a.m.

    I never saw posterization using 8 bits with a gamma 2.2 profile ;)

  • Members 2303 posts
    July 2, 2023, 2:07 a.m.

    dont see any posterization, show the edge where its posterized.

  • Members 3915 posts
    July 2, 2023, 2:22 a.m.

    I find banding can be more of an issue than posterization if edits are pushed too far when using 8 bits or are they two names for the same thing?

  • Members 976 posts
    July 2, 2023, 2:54 a.m.

    Banding is considered to be a form of posterization; I know of a very few corner cases where posterization with 8 bits is unavoidable on a photo. Pushing too far may result in posterization for whatever the image bit depth is, and usually what results in posterization on a display or in print is about the same for any editing space bit depth.

  • Members 2303 posts
    July 2, 2023, 3:20 a.m.

    your guess is as good as mine Danno

    www.yourdictionary.com/posterize

  • Members 2303 posts
    July 2, 2023, 3:21 a.m.

    it was that long a go i will see if i can find the raw if there was even one.
    i cant even remember how i lit the shinny little seed. i have one in the studio atm and finding it quite hard to replicate the lighting.

  • Members 3915 posts
    July 2, 2023, 7:14 a.m.

    In my experience it is usually only with gradients like a cloudless sky or in smaller scene elrments where posterization can become visually unacceptable if edits are pushed too far.

    If I pixel peep I would expect that maybe most images will have some posterization but the question then becomes is it noticeable and unacceptable under normal viewing conditions for the particular image.

  • Members 976 posts
    July 2, 2023, 12:27 p.m.

    I doubt that to be found on the main subject of a high-quality image, and posterization isn't about pixels, it's about significant clusters of pixels having no colour variations and thus lacking details.

  • Removed user
    July 2, 2023, 1:04 p.m.

    Fortunately for us these days, good editors use 32-bit floating point and a Linear wide-gamut workspace.

  • Members 976 posts
    July 2, 2023, 1:21 p.m.

    The destination is still effectively a low-bit monitor or a print ;)

  • Members 533 posts
    July 2, 2023, 3 p.m.

    Posterization, to me, is just quantization that manifests visibly. Contour banding is one of the most common and obvious forms that people see, common when they or their software use too much NR for 8-bit displays. If you want to polish a noisy image, you should always add a tad of equally-distributed noise (not Gaussian; it has unnecessary outliers) at a higher precision before converting to 8 bits.

  • Members 1737 posts
    July 2, 2023, 3:03 p.m.

    Not all good editors, not all the time. Example: Photoshop.