Tool for converting 12-bit TIFF images to 16-bit TIFF-images?

Hi,

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.
However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.
Conversion to 8-bit TIFF images is not an option because the images
are supposed to be used for quantitative evalutations (intensity
values) and I do not want to lose any information.

Hence, my question is: Which tool can convert 12-bit TIFF images to
16-bit TIFF images (or which tool allows opening 12-bit TIFF images
correctly and saving as 16-bit TIFF images)?

Peter

From: Peter Frank

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.

Photoshop 7 can indeed open 12 bit tiff files (in 16 bit mode) ... there is
something else wrong.

However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.

10, 12, 14 and 16 bit/channel files are ALL saved in 16 bit format (ie, double
the size of 8 bit files but with zeros in the unused bits) and open in
Photoshop in 16 bit mode just fine. You do not need to "convert" these files
to 16 bits.

Dunno why they open "totally black" but it's not because they are 12
bits/channel ... I open 12 bit/channel files in Photoshop all the time from my
film scanner and from Canon digital cameras and they are fine.

From: Peter Frank

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.

Photoshop 7 can indeed open 12 bit tiff files (in 16 bit mode) ... there is
something else wrong.

However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.

10, 12, 14 and 16 bit/channel files are ALL saved in 16 bit format (ie, double
the size of 8 bit files but with zeros in the unused bits) and open in
Photoshop in 16 bit mode just fine. You do not need to "convert" these files
to 16 bits.

Dunno why they open "totally black" but it's not because they are 12
bits/channel ... I open 12 bit/channel files in Photoshop all the time from my
film scanner and from Canon digital cameras and they are fine.

From: Peter Frank

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.

Photoshop 7 can indeed open 12 bit tiff files (in 16 bit mode) ... there is
something else wrong.

However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.

10, 12, 14 and 16 bit/channel files are ALL saved in 16 bit format (ie, double
the size of 8 bit files but with zeros in the unused bits) and open in
Photoshop in 16 bit mode just fine. You do not need to "convert" these files
to 16 bits.

Dunno why they open "totally black" but it's not because they are 12
bits/channel ... I open 12 bit/channel files in Photoshop all the time from my
film scanner and from Canon digital cameras and they are fine.

Do the images open properly with IrfanView?
http://www.irfanview.com/main_start_engl.htm




"Peter Frank" wrote in message
...
Hi,

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.
However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.
Conversion to 8-bit TIFF images is not an option because the images
are supposed to be used for quantitative evalutations (intensity
values) and I do not want to lose any information.

Hence, my question is: Which tool can convert 12-bit TIFF images to
16-bit TIFF images (or which tool allows opening 12-bit TIFF images
correctly and saving as 16-bit TIFF images)?

Peter

Do the images open properly with IrfanView?
http://www.irfanview.com/main_start_engl.htm




"Peter Frank" wrote in message
...
Hi,

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.
However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.
Conversion to 8-bit TIFF images is not an option because the images
are supposed to be used for quantitative evalutations (intensity
values) and I do not want to lose any information.

Hence, my question is: Which tool can convert 12-bit TIFF images to
16-bit TIFF images (or which tool allows opening 12-bit TIFF images
correctly and saving as 16-bit TIFF images)?

Peter

Do the images open properly with IrfanView?
http://www.irfanview.com/main_start_engl.htm




"Peter Frank" wrote in message
...
Hi,

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.
However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.
Conversion to 8-bit TIFF images is not an option because the images
are supposed to be used for quantitative evalutations (intensity
values) and I do not want to lose any information.

Hence, my question is: Which tool can convert 12-bit TIFF images to
16-bit TIFF images (or which tool allows opening 12-bit TIFF images
correctly and saving as 16-bit TIFF images)?

Peter

Photoshop does the converting internally, there is soe other problem. Have
you tried opening them in some other program?

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http://www.chapelhillnoir.com/links/mlinks00.html
A sample chapter from "Haight-Ashbury" is at
http://www.chapelhillnoir.com/writ/hait/hatitl.html

"Peter Frank" wrote in message
...
Hi,

I have some pictures taken by a CCD camera that are 12-bit TIFF
images. Photoshop (7.0) - even tough it opens them without an error
message - obviously cannot handle these properly as all images appear
totally black.
However, AFAIK Photoshop *can* handle 16-bit TIFF images, so what I
want to do is convert the 12-bit TIFF images to 16-bit TIFF images.
Conversion to 8-bit TIFF images is not an option because the images
are supposed to be used for quantitative evalutations (intensity
values) and I do not want to lose any information.

Hence, my question is: Which tool can convert 12-bit TIFF images to
16-bit TIFF images (or which tool allows opening 12-bit TIFF images
correctly and saving as 16-bit TIFF images)?

Peter

"RSD99" wrote:

Do the images open properly with IrfanView?
http://www.irfanview.com/main_start_engl.htm

Yes, they do. But I can only save them as 8-bit files, not as 16-bit
files.

Peter

"RSD99" wrote:

Do the images open properly with IrfanView?
http://www.irfanview.com/main_start_engl.htm

Yes, they do. But I can only save them as 8-bit files, not as 16-bit
files.

Peter