Save for Web will automatically convert a sixteen bit file to 8 bit, save as jpeg, and leave the original intact, but usually when one is in 16 bit the file is still too big for the web anyway.
You can actually, in the vast majority of cases, convert your printable files to 8 bit level 10 jpegs with no perceivable loss in quality.
Edited by Ross Peterson on Jul 28, 2005 at 06:58 AM GMT
I think the file format you want is JPEG2000 and Photoshop CS and CS2 support this. Problem is if I remember correctly web browsers do not support this file format.
You cannot save a 16-bit file as JPEG, it only allows 8-bit. Seeing that GIF is an older format, I would be surprised if it allowed anything more than 8-bit. Not sure about PNG files. That's your options for web-based graphics. Considering bandwidth issues, a compressed 8-bit image is preferable anyway; compress as much as possible without affecting appearance to be nice to people still stuck on dail-up.
In case the answer isn't evident (and from re-reading the thread I could see how it might have gotten lost in the clutter), if you don't want to "Save for web" you should convert the image to sRGB and to 8-bit mode, then save as JPEG.
I'm not sure what the best resizing strategy is. Fred has a "Web Presenter" plugin for Photoshop that gets good reviews; I imagine it takes care of all of the above plus sharpening.
To use my workflow as an example, I convert the image to 8-bit sRGB, use Fred's WP Pro to size the image, then Save As to JPEG (never use the Save for Web since all metadata gets stripped out). I usually set compression somewhere between 8 & 10.
Similarly, I've created a series of actions I call 'PSD ---> JPG". With one click it...
flattens
sets to 8 bit color
changes rez to 72 dpi (no resampling)
runs WP Pro to desired dimensions
runs Intellisharpen II
runs an AC Frames action
adds my signature line in proper location
converts to ColorMatch rgb
Then I simply 'save for web". An incredible timesaver.
Jeffrey wrote:
Similarly, I've created a series of actions I call 'PSD ---> JPG". With one click it...
flattens
sets to 8 bit color
changes rez to 72 dpi (no resampling)
runs WP Pro to desired dimensions
runs Intellisharpen II
runs an AC Frames action
adds my signature line in proper location
converts to ColorMatch rgb
Then I simply 'save for web". An incredible timesaver.
I missing something here. Convert to ColorMatch rgb for the web, why not sRGB?
Save for web does indeed strip off EXIF data. You need to decide if you want the EXIF data on web site photyos or not. In all files I now publish, wether it is on web site, or going to a prepress house, I have decided to strip away EXIF data, as I consider this proprietary info, and I want to control who has access to it.
Unless I'm mistaken, when the EXIF is stripped so is the IPTC which contains any copyright information that may have been entered (you do put in copyright statements, don't you?). For me it's important that that stays in the image, I personally don't care if anyone knows what the zoom, aperture, shutter speed, etc. are.
Jeffrey wrote:
Similarly, I've created a series of actions I call 'PSD ---> JPG". With one click it...
...
converts to ColorMatch rgb
Then I simply 'save for web". An incredible timesaver.
You should convert to sRGB, not to ColorMatch RGB, when you save for web.
The sRGB colour space was invented by Microsoft and HP and is supposed to represent the colour space of "the average monitor". That means that if you save your image in sRGB, you'll have a good chance that it will look OK on anybody's uncalibrated and unprofiled monitor.
Almost no webbrowser supports colour management, so it doesn't help if you save an ICC profile with your image (regardless of what colour space it's in) - webbrowsers will ignore it.
Sheila wrote:
Thanks all. I know I can "save for web" which I assume converts it to 8 bit but this deletes all the EXIF.
Cheers
Sheila
You could record a simple action that takes the 16bit file (TIF, PSD etc)
1) converts to 8-bit,
2) converts to a fixed size (suitable for web purposes) and then
3) converts to sRGB and
4) saves as a jpeg with a quality that meets your needs (either quality or size).
It leaves the TIF or PSD intact as a 16bit file
This does not strip EXIF out and is a one-click solution.
