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changing document from TIFF to PSB

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  #1  
Old 04-14-2010, 10:13 AM
Caravaggio Caravaggio is offline
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changing document from TIFF to PSB

I am using CS3. I am working on a very large TIFF document. The image is currently 126.9 M, 16 bits per channel and the color space is Adobe RGB 98. Sometimes when I try to save the document I get a message that it could not save because the document exceeds the 4 GB limit for TIff files. I am then forced to merge a bunch of layers together to reduce the file size. I don't really want to merge the layers, but don't seem to have any other choice.

I tried converting the document to a psb thinking that psb files don't have a 4 GB limit, but when I do the image becomes considerably darker. Is there a way to convert the document from a TIFF to a psb without the image's appearance changing? Why does it change since the new psb file has the same Adobe RGB 98 color space?

Does anyone have any suggestions? Thanks for your help.
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Old 04-14-2010, 10:38 AM
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Swampy Swampy is offline
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Re: changing document from TIFF to PSB

What happens if you change it to an 8 bit file? I've never heard of a file size limit for a TIFF file, but there may be one if you are saving a TIFF with layers. Can you save it as a raw Photoshop file?
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Old 04-14-2010, 11:00 AM
Caravaggio Caravaggio is offline
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Re: changing document from TIFF to PSB

Well saving it as a raw file flattens the image so there is only one layer. I tried it anyway just to see if the images appearance changed and it did. I received a message when I was changing the file to raw that "the photoshop Raw file does not fully encode the image mode and size among other things. The image many not fully be restored when you open it."

I need to keep the image at 16 bits because it is going to be printed very large.
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Old 04-14-2010, 11:06 AM
Steve13 Steve13 is offline
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Re: changing document from TIFF to PSB

If your computer hard drive is formated as fat32 there is a 4 gig file limit for all files. NTFS has no file limit.
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Old 04-14-2010, 11:15 AM
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jam1212 jam1212 is offline
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Re: changing document from TIFF to PSB

I think Swampy meant a .psd file, not a RAW file. You should be able to save it as a PSD and it will keep everything intact (that's what PSD's are for)
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Old 04-14-2010, 11:17 AM
Caravaggio Caravaggio is offline
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Re: changing document from TIFF to PSB

Sorry for my ignorance. Could you tell me what fat32 is and what NTFS is?

These are the specs for my mac.
Hardware Overview:

Model Name: Mac Pro
Model Identifier: MacPro3,1
Processor Name: Quad-Core Intel Xeon
Processor Speed: 3.2 GHz
Number Of Processors: 2
Total Number Of Cores: 8
L2 Cache (per processor): 12 MB
Memory: 16 GB
Bus Speed: 1.6 GHz
Boot ROM Version: MP31.006C.B05
SMC Version (system): 1.25f4
Hardware UUID: 0613ACB3-FECF-5AE8-9CBA-353B667E52A0
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Old 04-14-2010, 11:42 AM
Caravaggio Caravaggio is offline
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Re: changing document from TIFF to PSB

jam1212, I tried converting it to a psd document and the image changed becoming noticeably darker.

I just found out that fat 32 and NTFS are for windows system so that shouldn't be an issue as my mac has no limitation on file size.

Last edited by Caravaggio; 04-14-2010 at 12:02 PM.
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Old 04-14-2010, 12:52 PM
pixelzombie pixelzombie is offline
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Re: changing document from TIFF to PSB

that is bizarre, i have never seen a color shift when going from a tif to a psb file..i would try to change it to an 8-bit file and try saving as a tif again...
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Old 04-14-2010, 01:57 PM
Caravaggio Caravaggio is offline
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Re: changing document from TIFF to PSB

Well I guess this is just an "unhappy file with issues." Something is wrong. Even when I just make a duplicate of the file as a 16 bit TIff image the file changes in appearance becoming darker than the original.

I guess I will just have to keep working on the original as I have invested too much work in it and merging layers whenever it becomes too big and hope that the final image outputs the way it appears on my calibrated monitor.

Thanks everyone for all your help.
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Old 04-14-2010, 02:58 PM
Steve13 Steve13 is offline
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Re: changing document from TIFF to PSB

Sorry, I was thinking PC. Mac shouldn't have any problem with it.
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