Participant

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Is it possible to export Jpeg with more than 8 bits per channel?

Forum|Forum|9 years ago
January 5, 2017
2 replies
11301 views

My camera shoots 12 bits per channel but when exporting from lightroom at Jpeg i can see my image have got only 8 bits per channel.

How i can export jpeg from lightroom with 12 bits per channel?
Thanks!

This topic has been closed for replies.

Correct answer Per Berntsen

The jpg format is 8-bit only - the whole point of jpg is to produce small files. (16-bit files are twice the size of 8-bit files)

If you want more than 8-bit, you have to export as 16-bit Tiff or PSD.

But you would only need to do that if the image is going to be edited after exporting - otherwise 8-bit is fine.

You can't tell the difference between an 8-bit and a 16-bit image on screen - the advantage with 16-bit is that it can withstand heavy editing without deteriorating - it gives you editing headroom.

For more information about file formats and bit depth - see File formats and What is a digital image?

fipipi

Participant

Well, there is a jpeg standard for 12-bit jpegs

8 bit means 256 shades of Red, 256 Shades of Green and 256 Shades of Blue. Thats not so much if you have as example a sunset at the blue see or some color Gradients of a Fullsize Poster. But they will tell you the Story of 16.8 million colors - in theorie.

12 bit means the same with 1024 Shades of the colors if i'm correct - i think that would be much much better for most of the photos we process in the Lightroom Software.

So please ADOBE go from the Windows98 JPEG 8Bit Output into "the Future" from today with the 12-Bit JPEG.

Somebody has to start with Quality.

Next target are the camera companies, time is ready to have JPEGs that are better than just for preview.

Vote for 12 Bit JPEG additional to 8 Bit by contacting your ADOBE sales people ;-)

Greetings

Phil

johnrellis

Legend

I hadn't heard about 12-bit JPEG until now. A Google search suggests that 12-bit JPEG hasn't been incorporated into international standards, but rather is an extension to the popular "libjpeg", a software library that implements the standard:

JPEG/libjpeg v9.1 | photoscala

12 Bit JPEG Support: Open Talk Forum: Digital Photography Review

This is an important distinction, because few camera and software manufacturers will likely commit to 12-bit until there is an agreed-upon standard.

JP Hess

Inspiring

According to Wikipedia (so take that for what it's worth) JPEG 2000 will support ANY bit depth. I don't know if that's significant in this discussion or not.

Per Berntsen

Correct answer

Community Expert

The jpg format is 8-bit only - the whole point of jpg is to produce small files. (16-bit files are twice the size of 8-bit files)

If you want more than 8-bit, you have to export as 16-bit Tiff or PSD.

But you would only need to do that if the image is going to be edited after exporting - otherwise 8-bit is fine.

You can't tell the difference between an 8-bit and a 16-bit image on screen - the advantage with 16-bit is that it can withstand heavy editing without deteriorating - it gives you editing headroom.

For more information about file formats and bit depth - see File formats and What is a digital image?

I

ioannismarAuthor

Participant

Thank you Per Berntsen!

So, my export options for more than 8 bits per channel is PSD or TIFF...
is there any way that i can do (ex. with plugins) to add more image formats such like PNG or any other image format that supports 12 or more bits per channel?

thanks!

D

dj_paige

Legend

Lightroom only supports the formats listed when you output. There are no plugins to change this.

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