Editing advice - FlyBoyOne

[dlowwa]

Hello All
Just wondering if anyone had any tips on how to prevent JPG Compression on a Canon?
Cheers
FBO

You need to be a little more specific. What kind of compression are you talking about? Have you received rejections for such recently?

In general, there are three things that result in a 'compression' rejection at JP:

1) actual highly compressed jpegs, i.e. not saved at maximum quality
2) banding effects, often seen as Quebec Golf noted in skies with a color/brightness gradient
3) 'pixel smearing' that you often see on images taken with cameras with small sensors (point and shoot/bridge cameras/cell phone camera)

Each of those issues would be resolved in a different manner, so best to be as specific as possible with what you are asking.

[jvdl]

You have to make a research about ''jpeg compression artefacts''

No, preventing compression (i.e., lossless image capture) and preventing artifacts arising from excessive compression are two different topics. If the OP meant the latter, he should have been more specific.

[theaviationspotter]

But nowhere did he mention artifacts, he asked how to avoid compression when shooting JPEGs.

You have to make a research about ''jpeg compression artefacts''

[Quebec Golf]

JPEG Artefact is completely related to how you edit the photo and how you saved etc. No any single relation with JPEG/RAW format or Photo Machine brand.

Very true.

Also, it's not just that jpeg is lossy by definition that will cause you to see jpeg artefacts, it's also the fact it's 8 bit colour. Think of a picture that is 800 pixels tall that has blue sky of varying shades from top to bottom. There are only 256 shades of blue to choose from in 8 bit (and they won't all be present in that picture). If the sky is smooth enough you'll definitely have visible banding perpendicular to the direction of the gradient. Since you have to go to jpeg eventually, it wouldn't matter if you started with RAW or not in this case.

How not to have jpeg compression artefacts?
1. Save at max quality
2. Take it easy on noise reduction in your processing
...not necessarily in that order!

P.S. RAW definitely captures more data and lends itself to a broader scope of editing, no question about that IMO

Regards,

Alex

[jvdl]

Totally wrong idea that I can not agree with you. JPEG Artefact is completely related to how you edit the photo and how you saved etc. No any single relation with JPEG/RAW format or Photo Machine brand.

But nowhere did he mention artifacts, he asked how to avoid compression when shooting JPEGs.

[theaviationspotter]

JPEG is a "lossy compression" format by definition and design. If you want to avoid compression, you must use RAW.

Totally wrong idea that I can not agree with you. JPEG Artefact is completely related to how you edit the photo and how you saved etc. No any single relation with JPEG/RAW format or Photo Machine brand.

Yes, you shouldn't be shooting JPEG if your at least somewhat serious or wanting to edit your photos. Because JPEG is compressed, you cant adjust the exposure, colour, WB like you can do with RAW.

Another wrong idea. If you know how to do it, you can also edit JPEG files like RAW editing. On the other hand; RAW is a system that should be preferred, but it is wrong to say ''annot be done'' in term of editing JPEG file

[meeshboi]

Yes, you shouldn't be shooting JPEG if your at least somewhat serious or wanting to edit your photos. Because JPEG is compressed, you cant adjust the exposure, colour, WB like you can do with RAW.

[mahagonny]

It is not always true. Shooting in jpg is acceptable if you use a high format value. It certainly does not depend on the brand of the camera. Certainly shooting in RAW is a better method, but then this should also be saved in jpg to be accepted on JP.
I use to process the RAW file and only at the end cut to 1200 x 800 px saving in jpg to the maximum size. If you use photoshop save the photo at the highest quality (12).
Excuse my bad English.

[jvdl]

Hello All
Just wondering if anyone had any tips on how to prevent JPG Compression on a Canon?
Cheers
FBO

JPEG is a "lossy compression" format by definition and design. If you want to avoid compression, you must use RAW.

[FlyBoyOne]

Hello All
Just wondering if anyone had any tips on how to prevent JPG Compression Aretfacts on a Canon?
Cheers
FBO