I uploaded this images on Instagram using color space sRGB, 8 bit (as recommended) . Size: long edge: 2160 px.

The original images wasn't this color pixaleted (notice faint magenta bar running from tree to tower) as do the uploaded one in instagram. (changes marked in white circle)

Also, I am unable to see this prominent color boundary or bar formation (magenta to bluish shade) in my dell laptop screen in the original file, as visible over here in smartphone. Kindly, address this part as well. Also, could slight change in shadow area of color grading (lightroom classic) do this much banding (with 30% blending). I have no clue, this is the first time it's come to my notice, .

Could anyone shed some light.

instagram image as saved in phone

original image

  • 1
    One of the things you're trying to look at the picture on has poor [or no] profiling or colour repro. The pictures are to all intents & purposes identical [other than size], even if you overlay half of one on the other, there is no discernible difference on a colour-managed workspace - i.stack.imgur.com/4SSej.jpg The slight blue/red banding is there equally on both.
    – Tetsujin
    Jul 16 at 15:00
  • I don't know, if these images could be downloaded, if you enlarge it by as much as 25% difference in banding area is easily visible. Could you share, what do you mean by color profiling and how to ensure this doesn't happen in future work. Jul 16 at 19:26
  • The files are both heavily compressed jpgs. There is very little detail in those colour bands & they do have pretty hard edges. Here I've blown up one segment, then heavily contrasted it to show how hard the edges actually are - i.stack.imgur.com/sQLQx.png
    – Tetsujin
    Jul 17 at 13:20
  • 1
    Looks like the damage was done at the original export to jpg, before you uploaded it to instagram [who will probably compress it again]. Testing by doing the same over-emphasis as before, your original looks like this [this is meant to make everything look worse to see what's going on] - i.stack.imgur.com/VJ53c.jpg - grainy but still quite 'smooth' in the transitions. Saving it out again as a smaller jpg at 50% quality, the same process gives this - i.stack.imgur.com/62cu4.jpg - & you can easily see the reasonably smooth transitions have now become very blocky.
    – Tetsujin
    Jul 18 at 9:07
  • 1
    I don't know what more I can offer. Small, low qual jpgs will show banding & heavy pixellation. How bad that is depends on your screen calibration & how far it was compressed. trusting an online site to properly re-compress & resize is probably not the way to go about it. Send them what they want, don't let them change it..
    – Tetsujin
    Jul 18 at 10:24

What you are probably seeing is the difference between how your display devices scale down the larger image and how they display the smaller image when you look at it on Instagram.

Viewed at the same size, there's no significant difference between the two images.

  • Lets forget about color pixel mess at the boundary of the band I tried looking at same scale in both laptop and mobile putting side by side. Samsung A71 shows this prominent banding while in laptop its not much noticeable. My question is, does it have to do with the numbers of color by dell (2014) laptop and my samaung A71(2020) can show. Jul 17 at 4:49
  • 1
    @pixhibit.samco Has either device been calibrated and profiled? We can't see what you're seeing on your devices unless they've been brought as close as possible to the same (standardized) color response that properly calibrated and profiled devices are outputting. It could well be that the differences in your two displays are emphasizing the very subtle differences.
    – Michael C
    Jul 18 at 2:22

Your two images look essentially identical. Here is a map of the difference once one is scaled to match the other:

![enter image description here

The white is the pixels where the difference in level is 3 or more (difference along contrasting edges is due to rescaling).

As far as I can tell the purple bands are in both images, and it indeed looks like banding:

enter image description here

A smartphone is not a good instrument to judge the quality of a photo, the display is subject to a lot of processing whose only goal is to look better than the competition (more contrast and saturation, not more accuracy). By contrast your Dell will always look a bit bland, especially if equipped with a TN screen.

  • I have tried to look again at post processing job. I found that gradient filter that I used to add haze to the atmosphere (dehaze slider to left, and blacks to right, minute exp increase ) above the top half portion of the image, just above the band region, is the main culprit. More so because I applied luminance mask with 38 % smoothening, creating no-so -smooth fading. This in turn, allowed for clear pixel boundaries after Instagram compression. Correct me if my analysis could be wrong? Jul 18 at 7:17

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