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Weird Gradient Banding Issues When Saved As .jpeg

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Hi guys, I have been experiencing a weird problem with some of my renders and really need some help if possible. Basically, I am exporting my image as a .tiff file and then importing it into Photoshop, cropping as required and saving out as a .jpeg using highest quality settings. However, when I do so I have noticed some of my images show major problems with gradients and banding as shown in the screen shots below. As far as I am aware I am using RGB colours in Cinema and I just don't know what to do here. Any help would be greatly appreciated.

IMAGE shows a section of the image badly affected when saved to a .jpeg.

post-44915-1248127438_thumb.jpg

Thanks,

vreb

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Try saving it as a 16 bit PSD format and then export it to an 8 bit Jpeg.

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Wild stab in the dark-

It might be your colour profile in P/shop -try edit, convert to profile, -sRGB & then saving as a jpeg.

Regards

Andy :)

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Thanks guys, I'll give your suggestions a try and see if that helps.

L8rz,

vreb

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Well, none of those ideas worked but thanks anyway. I have tried exporting as a .jpeg directly from Cinema too, and get the same issues. I have checked I am using RGB and can't understand it.

Cheers,

vreb

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Can you post a simple scene file with your render settings and this errant material. A simple sphere and plane should do.

Could you also add a matching snap of the original render which has none of the banding. Just for comparison.

Cheers, Alan.

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Hi Alan, thanks for the help here. I will provide the info and files you need first thing tomorrow if thats ok as its now 01:09 and my machine is now rendering. I really appreciate the help and will get everything for you as soon as I can. More than anything, this is one of those issues which I really want to know the answer to for both my own sanity and future reference in case I come up against it again. Speak soon and all the best,

vreb

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I love these little technical puzzlers, they brighten up my day.. I mean night.. or whatever o'clock it is. :)

Cheers, Alan.

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This is a very common problem when working with Gradients going from 16bit's to 8bits. May I suggest you use a higher bit depth file format than 8 bits?

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Hi Guys, thanks for the info.AlanBell, as far as I am aware I am not using any 16-bit files and am exporting 8-bit .tiffs from Cinema too. So I don't think the problem is being caused by converting from 16 bit to 8, but I'll double check that anyway so thanks.

I can't post an image of the problems I am having because as soon as I save the .tiff file as a .jpeg file it causes the issues to appear and I don't think I can post a .tiff file right? I will put these files in a zip.

Alan, I have forgot how to provide the file for you as it is a .zip. I have attached it here but can't remember if there was another way I was supposed to do it. Please could you advise as you need to see the full size .tiff original VS the saved .jpeg to really see the issues.Thanks again for this and I am extremely grateful for any time you may spend on it.

Thanks,

Jay

Files here:

There is an original .tiff file to compare against a saved .jpeg file and one .c4d file too. Please make sure you are viewing through perspective on main camera when you open it. The just render it as a .tiff and saved to a .jpeg to see the issues. You can even just export directly as a .jpeg and you get the same issues too. It has to be a colour problem I am sure but as I am only using 8-bit files I just don't understand how!

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There isnt any difference between the jpeg and the tiff, visually or comparing in Pshop using image calculations. No banding, nothing like that. There is only a maximum 1% difference using calculation, which is probably a result of the jpeg compression.

wilson

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Hi Wilson, thanks for the info. Have you looked at my images or are you just talking from experience as I can see huge differences between the two images (.tiff & .jpeg) on my monitor. The gradient areas look very compressed and almost pixelated in some areas on the .jpeg image. I don't understand what I can do about it though as I am saving using the highest quality .jpeg setting too. I would be interested to know if anyone else can see the differences between both the .jpeg and .tiff files too. I have two very high quality HP monitors running in sRGB mode, but doubt they could be any cause of such issues here. I rendered the image out to .tiff, then looked at it at 100%+ and it looked fine. Once saved to .jpeg and viewed at 100%+ you can really see the difference in quality and all the bad artifacting in the .jpeg.

Cheers,

vreb

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