PDA

View Full Version : A simple question about saving files

alan sh
24th of January 2005 (Mon), 02:15
I am being thick today....

I open a raw file in Adobe PS CS - convert it and I want to save it. But it will not let me save it as a JPG - only PSD or TIF (or a few other weird ones).

If I save it as TIF and open it, I still don't get the option to save as JPG.

So, how do I go about this ?

Alan
Jesper
24th of January 2005 (Mon), 02:29
You have a 16 bits per channel image.
Convert the image to 8 bits per channel (Image / Adjustments / 8 bits per channel).
The JPEG file format does not support more than 8 bits per channel.
robertwgross
24th of January 2005 (Mon), 03:59
Not in Adobe, but I've made 16-bit JPEGs quite a bit.

---Bob Gross---
alan sh
24th of January 2005 (Mon), 05:24
You have a 16 bits per channel image.
Convert the image to 8 bits per channel (Image / Adjustments / 8 bits per channel).
The JPEG file format does not support more than 8 bits per channel.

thanks. It's actually IMage -> Mode -> 8-bit. But you gave me the pointer I needed.


alan
steven
24th of January 2005 (Mon), 08:42
Not in Adobe, but I've made 16-bit JPEGs quite a bit.

---Bob Gross---

How???

Since JPEG is an 8bit format???

Some programs will seamlessly convert a 16bit down to an 8bit but I don't think you really have a 16bi JPGE.

If you do you you post or link an example?

Thanks

steve
Jesper
24th of January 2005 (Mon), 09:39
Not in Adobe, but I've made 16-bit JPEGs quite a bit.

---Bob Gross---The standard JPEG format (JFIF, JPEG File Interchange Format (http://www.jpeg.org/public/jfif.pdf), ISO/IEC IS 10918-1 or ITU-T Recommendation T.81) only supports 8 bits per channel and one or three channels (grayscale or RGB colour). So you must have been using something else than the common standard JPEG file format. Maybe some other file format that uses the same compression algorithm?