photoshop & Jpeg

[alpine62uk]

For some reason I'm not able to save to jpeg as the fromat is not an option.

I have saved many times before in jpeg from raw on photoshop but the option is no longer there.

Can anyone help?

Antony

[Radtech1]

You have to flatten the image first. JPGS cannot have layers.

Rad

[ssim]

My guess is that you are converting the CR2 file as a 16 bit tiff. PSCS does not allow you to save a 16 bit tiff as a JPEG (I'm not technically inclined enough to say why). I did a couple of quick tests here and you can do this if you convert to 8 bit. You can do a Save for Web to a JPG off of th 16 bit tiff.

[alpine62uk]

You have to flatten the image first. JPGS cannot have layers.

Rad

Thanks for the reply

How do I flatten the image

[Radtech1]

You have to flatten the image first. JPGS cannot have layers.

Rad

Thanks for the reply

How do I flatten the image

Assuming that you do have multiple layes, and the problem is not the 16 bit issue, then look along the top of Photoshop for a heading called "Layers" then click that. If the phrase "Flatten Image" is NOT greyed out then you have layers. Click "Flatten Image" and then all will be well.

Rad

[alpine62uk]

You have to flatten the image first. JPGS cannot have layers.

Rad

Thanks for the reply

How do I flatten the image

Assuming that you do have multiple layes, and the problem is not the 16 bit issue, then look along the top of Photoshop for a heading called "Layers" then click that. If the phrase "Flatten Image" is NOT greyed out then you have layers. Click "Flatten Image" and then all will be well.

Rad

Thanks Rad

I've learnt a few things tonight, the issue was the 16bit, once i went to 8 bit everything was ok.

Do you know why the save went into 16bit save mode? and what is the difference and when would you use 16 or 8 bit

Thanks Antony

[tofuboy]

fyi... You can do a save as jpg regardless of if you have layers or not. As was pointed out, it has to be 8 bit to save as jpg

The difference between 16 bit and 8 bit mode is date. A 16 bit image has loads more data than an 8 bit image. The visual difference isn't noticable, but it is best to edit in 16 bit mode. You can 'stretch' the colors to a finer degree.

8 bit images have 255 levels of intensity, where 16 bit images have 65535 levels of intensity. (I think those numbers are right)

[Jesper]

8 bit images have 255 levels of intensity, where 16 bit images have 65535 levels of intensity. (I think those numbers are right)

Almost.... :) 8 bit = 2^8 = 256 levels per channel, 16 bit = 2^16 = 65,536 levels per channel.

About why you would sometimes want to edit in 16-bit mode: The High-Bit Advantage (http://www.creativepro.com/story/feature/7627.html).

[Radtech1]

8 bit images have 255 levels of intensity, where 16 bit images have 65535 levels of intensity. (I think those numbers are right)

Almost.... :) 8 bit = 2^8 = 256 levels per channel, 16 bit = 2^16 = 65,536 levels per channel.



You are both right. 256 values, BUT is that 256 levels of intensity? The number 255 is correct when when 0 intensity is not counted as a "level of intensity". So the question is, Is a complete absence of intensity, in fact, an intensity?

Personally, I am falling in the 255 camp.

Rad

PS. Ditto for 16 bit.