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Answered

Undesirable changes from C2 to JPEG

Forum|Forum|2 years ago
January 8, 2024
7 replies
1974 views

Hello all,

This is not the first time this has happened, but I think it's time I find out why it's happening!

I have a lovely RAW file that looks great post processed, at 200%, but when saved to JPEG, the sky has color banding (At least I think banding is what it's called--I am still a relative newbie!). I don't understand =(

I am attaching a screen shot of the sky IN LRC, at 200%. please tell me if you see a problem. If not, why would it change during the save?

This topic has been closed for replies.

Correct answer Rob_Cullen

Banding is an artifact that can occur when an image is reduced to an 8bit file as in a JPG. Banding is more commonly to be seen in skies or large uniform areas of an image where there are very subtle changes in color tone.

See this link for explanations- (even in the first "Sunset & Bird" example)

JPG COMPRESSION EXPLAINED by Jeffrey Friedl

This link talks about Banding in Photoshop (Where introducing Noise is a work-around)

https://www.slrlounge.com/remove-banding-photoshop/

Rob_Cullen

Correct answer

Community Expert

Banding is an artifact that can occur when an image is reduced to an 8bit file as in a JPG. Banding is more commonly to be seen in skies or large uniform areas of an image where there are very subtle changes in color tone.

See this link for explanations- (even in the first "Sunset & Bird" example)

JPG COMPRESSION EXPLAINED by Jeffrey Friedl

This link talks about Banding in Photoshop (Where introducing Noise is a work-around)

https://www.slrlounge.com/remove-banding-photoshop/

Regards. My System: Windows-11, Lightroom-Classic 15.3, Photoshop 27.5, ACR 18.3, Lightroom 9.3, Lr-iOS 10.4.0, Bridge 16.0.3 .

ImaRetiredTeacherAuthor

Known Participant

Hi,

The JPG compression link is dead =(

R

richardplondon

Community Expert

FYI the link is to a webpage whose address starts http - most browsers now presume (or will even forcibly override to) a https version of the chosen webpage - meaning, one with addressing that refers to a security certificate. This is done by general policy, as a reassurance and a protection for the website visitor.

But in this instance, no website version with https is available.

My Microsoft Edge browser insists on trying for a https webpage even when you've edited out the unwanted "s" from the address bar. I find my Chrome browser also initially overrides to https, but is prepared to accept my correction back to http - whereupon I can see this site is still there, as of today, as below

My own takeaway from JPG resizing and compression discussions is (all IMO): number of pixels is a more significant consideration for output than compression is; there is an 'output' sharpening decision to be made that depends on the specifics of resizing and also on the circumstances of viewing or other usage; the 'sweet spot' for compression lives in a relatively narrow useful range (I use 80 for screensized images, 60 for full original res images, when exporting to web); that there is only so much you can do with compression anyway, very strong compression (low %) not being worth having - far better to resize to fewer pixels, and use a more normal saving quality; that setting 100% is still not lossless, offering no clear advantage over say 80-90% so far as seen output quality, at a disproportionate penalty in file size; that if a file is being output for further postprocessing instead, one is better off likely with TIFF - which does allow genuinely lossless saving and re-saving.

GoldingD

Legend

And, can you post in a reply a screenshot of your Export Screen?

Example:

/example deleted to save scroll space as OP has posted the requested info/

ImaRetiredTeacherAuthor

Known Participant

Hi, still learning so I must ask if "Color Space" could be my problem? Should I change it to what you have? Thanks!

GoldingD

Legend

No, I would have been concerned if you placed extreme limits on size . resize.

Authors export screen from attachment :

GoldingD

Legend

Yes, this is a SOP inquiry, but it needs asking

Please post your System Information as Lightroom Classic (LrC) reports it. In LrC click on Help, then System Info, then Copy. Paste that information into a reply. Please present all information from first line down to and including Plug-in Info. Info after Plug-in info can be cut out as that is just so much dead space to us non-Techs and it takes up vast amounts of scroll space making the reply less readable and less likely that others will bother with your post.

example:

Lightroom Classic version: 13.1 [ 202312111226-41a494e8 ]
License: Creative Cloud
Language setting: en
Operating system: Windows 11 - Home Premium Edition
Version: 11.0.22631
Application architecture: x64
System architecture: x64
Logical processor count: 32
Processor speed: 2.9GHz
SqLite Version: 3.36.0
CPU Utilisation: 0.0%
Built-in memory: 65243.7 MB
Dedicated GPU memory used by Lightroom: 8624.8MB / 8032.0MB (107%)
Real memory available to Lightroom: 65243.7 MB
Real memory used by Lightroom: 7499.4 MB (11.4%)
Virtual memory used by Lightroom: 16013.5 MB
GDI objects count: 1884
USER objects count: 4079
Process handles count: 7890
Memory cache size: 0.0MB
Internal Camera Raw version: 16.1 [ 1728 ]
Maximum thread count used by Camera Raw: 5
Camera Raw SIMD optimization: SSE2,AVX,AVX2
Camera Raw virtual memory: 1262MB / 32621MB (3%)
Camera Raw real memory: 971MB / 65243MB (1%)
System DPI setting: 144 DPI (high DPI mode)
Desktop composition enabled: Yes
Standard Preview Size: 1440 pixels
Displays: 1) 3840x2160
Input types: Multitouch: No, Integrated touch: No, Integrated pen: Yes, External touch: No, External pen: No, Keyboard: No

Graphics Processor Info:
DirectX: NVIDIA GeForce RTX 3070 (31.0.15.4633)
Init State: GPU for Export supported by default
User Preference: Auto

Application folder: C:\Program Files\Adobe\Adobe Lightroom Classic
Library Path: F:\My Photography\Events\Aviation\Airshows\NAF El Centro Air Show 2011\Air Show 2011-v13.lrcat
Settings Folder: C:\Users\DavidsLocal\AppData\Roaming\Adobe\Lightroom

Installed Plugins:
1) AdobeStock
2) Aurora HDR
3) DxO PhotoLab 5

______________________________________________________________________________________

The above is almost always asked for. And in the community guide, their is an explanation.

From Community How-To Guide - Tips & Best Practices

Supply pertinent information for more timely and effective answers
The more information you supply about your issue, the better equipped other community members will be to answer. If you're unsure on how to do this, you can copy and paste this template:

*************

Explanation of the issue including what you were doing when the problem occurred, what you were trying to achieve, and any other information you may think is useful.

Adobe product and version number
Operating system and version number
Error message(s) (if applicable)
Computer hardware, such as CPU; GPU; the amount of RAM; etc.
Screenshots of the problem (if applicable)

GoldingD

Legend

So, your discussion is now in the Lightroom Classic community, where it belongs.

Moving on.

1. Inquiry about the attachment.

The screenshot you included as an attachment in your initial post. It looks like it is from your LrC develop module. And it looks like it is probably your original with develop mods,and you have zoomed in tight.

Is that correct?

If it is of you exported JPEG, then why the edits in the history panel?

If it is the original with edits, zoomed in. What is the point of posting that? Perhaps you posted the wrong image?

For my fellow member that hats attachment, and as to show (hopefully) what I see, I have inserted a scrennshot of the authors attachment below:

2. A request

If you should reply with a different screenshot, consider using the Insert Photo button, instead of using a attachment.

From Community How-To Guide - Tips & Best Practices

Add screenshots, images, and attachments

As a best practice, please add images (jpeg, png, etc.) via the Insert Photos tool

Nancy OShea

Community Expert

[Moderator moved from Stock Contributors to Lightroom Classic.]

Equipment matters.

Check the system & GPU requirements for LR Classic.

https://helpx.adobe.com/lightroom-classic/system-requirements.html

https://helpx.adobe.com/lightroom-classic/kb/lightroom-gpu-faq.html

When was the last time you calibrated your computer's display?

Do you have the last graphics drivers from your card maker's website?

Nancy O'Shea— Product User & Community Expert

daniellei4510

Community Expert

You need to upload the original file. As uploaded, it looks fine. Does the banding you speak of show up when viewed in Photoshop as well?

Adobe Community Expert | If you aren't submitting your assets in sRGB, you probably didn't read the rules.

ImaRetiredTeacherAuthor

Known Participant

Nope, looks perfect in photoshop also. I have also had other weird things happen on occassion. Sometimes, after I send an image from LRC to PS for a simple edit, when I start working again, after the tiff is sent back to LRC, there are blown-out highlights that weren't there when I sent it. You may think I've made some type of error to cause such things, but I send images to PS on a regular basis and nothing unusual happens 98% of the time. I've learned to close LRC and restart my computer before sending anything to PS, otherwise, it doesn't always send the file back like it's supposed to do. I sometimes think odd things happen to me because I'm a monthly subscriber. Who knows? Technology is not perfect for sure. I'm not going to explain my entire life on here. I thought perhaps someone else had experience with this issue and could steer me in the right direction. If it hasn't happened to you persoanlly, you most likely cannot help me. I suppose this does belong on the other forum. Can someone please provide the link so I definitely end up in the correct place? Thx

Jill_C

Community Expert

Click on the Adobe Community link at the very top of this page which will direct you to a listing of all the Community Forums.

Jill C., Forum Volunteer

RALPH_L

Community Expert

It is impossible for us to help you with this screen shot. Also, the LR forum is probably a better place to ask.

Usually, color banding occurs through compression. What export "file settings", "image settings" and ""output sharpening" parameters have you set? If you want to, send me your RAW file in a PM and I will examine and export it for a comparison.

ImaRetiredTeacherAuthor

Known Participant

Same sexport ettings I always use. Plenty of light during exposure.and standard processing (per me, that is). I prefer not to send my file. and file is unneccessary for this question.

Jill_C

Community Expert

The question cannot be answered based on the image you uploaded, as the banding you detected is not visible here.

Jill C., Forum Volunteer

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