Problems coverting tif from 16 to 8 bit

[david-m]

I have been happily converting scanned 16 bit images into 8 bit (using PS CS2 on a Mac

G5) until today. In PS under image-mode, it confirms that I have converted to 8 bit, but

when veiwed through bridge it says I still have a 16 bit image. Duh, any ideas. I have tried

saving, closing down bridge and re-opening but still says 16 bit, even though it also

shows it as being half the file size of the 16 bit image.

 

Any ideas please, as I want to submit some images to a stock library and I am concerned

they will veiw it on (eg) Bridge and see it as a 16 bit image, so reject it

 

Thanks

 

David

[ellis_vener_photography]

Why would they reject a 16 bit image? Are you saving the 8 bit version in a different folder

perhaps?

[denisgermain]

worst comes to worst....

1. open the file

2. Select All

3. Copy

4. Create a New Document

5. Paste

6. Double check to make sure it is really set to 8bit

7. Save as

[david-m]

I am just converting and saving, so it's the same image in the same folder. The library

specifically asks for 8 bit, as this is what a printer would require from someone who buys

it. if it is a 16 bit image at (say) 50mb then the client or library may reject it as being too

small when converted down to 8 bit for printing.

 

This is driving me crazy, as I have spent weeks doing this same proceedure with no

problems. Just baffles me.

 

Regards

 

David

[ellis_vener_photography]

I am having trouble understanding why you'd ever want to overwrite a 48 bit file with a 24

bit version. At the very least I hope you are archiving the 48 bit version in another folder

on another drive even if it is just on a CD-R or DVD-R

[Ed_Ingold]

Bridge is refering to an old preview data. Try refreshing the preview.

[david-m]

So what is happening is - when I batch scan slides (using Nikon 5000 and SF210) with

Nikon Scan, it embeds 16 bit info that does not seem to be able to be changed with PS,

but if I batch scan though Twain in PS it converts to 8 bit with no problems.

 

Trouble is that when I use Twain through PS, I am unable to check the box that 'saves to

file' in the Nikon prefs, so that they the new scans (130mb) pile up on the desktop until

the computer freezes (I have 1.5GB of RAM). Aaaargghh. Surely someone must use the

batch slde feeder with the nikon 5000 and a G5 with CS2 - surely.

 

Any thoughts please.

 

Thanks

 

David