TIF Rotation

"Jules" wrote in message

Hello,

I’m trying to rotate a picture with Photoshop. When I do that with a JPEG picture, I can do 180, 90, -90 degrees or customized.
But, when I try to do that with a TIF picture, I can only do 180, 90 or -90 degrees rotations, but not a customized rotation.
Why is the "customized" button locked with a TIF picture ?
Thank you.
Jules

What vesion of PS are you using. In CS3 it is 180, 90CW, 90CCW or aritrary and it dosen’t matter if it is jpg or tiff.

DBLEXPOSURE a écrit :

What vesion of PS are you using. In CS3 it is 180, 90CW, 90CCW or aritrary and it dosen’t matter if it is jpg or tiff.

I am using CS2, and there is not arbitrary for the .tiff pictures ; only 180, 90cw and 90ccw.

Jules

In article <47445382$0$25920$>,
Jules wrote:

Hello,

I’m trying to rotate a picture with Photoshop. When I do that with a JPEG picture, I can do 180, 90, -90 degrees or customized. But, when I try to do that with a TIF picture, I can only do 180, 90 or -90 degrees rotations, but not a customized rotation.

Why is the "customized" button locked with a TIF picture ?
Thank you.
Jules

Check the Image Mode of your TIF file. If it’s Grayscale, RGB, … then an arbitrary rotation will be available in CS3. If the mode is Bitmap then arbitrary rotation is not available. It makes sense that an arbitrary rotation is disabled when every pixel has to be either black or white.

Jules wrote:

DBLEXPOSURE a écrit :

What vesion of PS are you using. In CS3 it is 180, 90CW, 90CCW or aritrary and it dosen’t matter if it is jpg or tiff.

I am using CS2, and there is not arbitrary for the .tiff pictures ; only 180, 90cw and 90ccw.

You should have a menu ‘Image – Rotate Canvas’. In the submenu of ‘Rotate Canvas’ you will find 180°, 90° CW, 90° CCW, Arbitrary, Flip Canvas Horizontal and Flip Canvas Vertical. That is irrespective of the file format, so it applies to TIFF too.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.com

* Bruce Uttley:

In article <47445382$0$25920$>,
Jules wrote:

Hello,

I’m trying to rotate a picture with Photoshop. When I do that with a JPEG picture, I can do 180, 90, -90 degrees or customized. But, when I try to do that with a TIF picture, I can only do 180, 90 or -90 degrees rotations, but not a customized rotation.

Why is the "customized" button locked with a TIF picture ?
Thank you.
Jules

Check the Image Mode of your TIF file. If it’s Grayscale, RGB, … then an arbitrary rotation will be available in CS3. If the mode is Bitmap then arbitrary rotation is not available. It makes sense that an arbitrary rotation is disabled when every pixel has to be either black or white.

Just about to post about the image mode, but I could never understand why the color of the pixel makes a difference in rotation?

Brian wrote:

Check the Image Mode of your TIF file. If it’s Grayscale, RGB, … then an arbitrary rotation will be available in CS3. If the mode is Bitmap then arbitrary rotation is not available. It makes sense that an arbitrary rotation is disabled when every pixel has to be either black or white.

That may be the explanation, but why does that make sense? You can still do the following:

– change bitmap to greyscale
– rotate aribrary
– change greyscale to bitmap

Why couldn’t Photoshop give the same result without you having to do those mode changes?

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.com

"Jules" wrote in message

DBLEXPOSURE a

In article <1i7xyss.sqbg861yopxizN%>,
Johan W. Elzenga wrote:

Bruce wrote:

Check the Image Mode of your TIF file. If it’s Grayscale, RGB, … then an arbitrary rotation will be available in CS3. If the mode is Bitmap then arbitrary rotation is not available. It makes sense that an arbitrary rotation is disabled when every pixel has to be either black or white.

That may be the explanation, but why does that make sense? You can still do the following:

– change bitmap to greyscale
– rotate aribrary
– change greyscale to bitmap

Why couldn’t Photoshop give the same result without you having to do those mode changes?

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.com

I guess I should have written that it made sense ‘to me’. Clearly Photoshop could do an arbitrary rotation of a Bitmap image and show the result as a Bitmap image in the manner that you suggest.

I think the resulting image would not be what was expected however. The image that I would expect to see would be the result of just your first two steps: convert to grayscale and rotate arbitrarily. That final convert back to Bitmap ‘could’ change the perceived image dramatically/unexpectedly. As an improvement, I would like to see an informative message appear when ‘Arbitrary’ was clicked rather than having the selection grayed out. Then the user could choose how to continue.

In article ,
Brian wrote:

Just about to post about the image mode, but I could never understand why the color of the pixel makes a difference in rotation?

Because you can not rotate a pixel. When Photoshop rotates an image, it starts from the source image, then maps the source image onto a new image that is rotated from the original. If oyu have an image that is black in the original, the result of this mapping could very well be 50% gray.

In a bitmap, you can not have a pixel be 50% gray. If you rotate a bitmap by an arbitrary amount, the result is often hideously aliased (stairstepped) and distorted, because Photoshop can not create pixels of intermediate value. To see what I mean, take a bitmap, convert it to grayscale, rotate it an arbitrary amount, then convert it back to bitmap using the 50% threshold option. Notice how bad it looks?

—
Photography, kink, polyamory, shareware, and more: all at http://www.xeromag.com/franklin.html

In article <47445382$0$25920$>,
Jules wrote:

Why is the "customized" button locked with a TIF picture ?

It’s not. It makes no difference to Photoshop what format the picture started out as; when it is loaded into memory, it is just a bunch of pixels held in RAM, regardless of whether it was a TIFF or a BMP or a JPEG or some other format to begin with.

You are not having problems because you’re starting with a TIFF. You are having problems for some other reason–perhaps because that particular TIFF is in bitmap or indexed color mode, or maybe because the TIFF is in a strange number of bits per channel.

What is the color mode of the TIFF you are having trouble with?

—
Photography, kink, polyamory, shareware, and more: all at http://www.xeromag.com/franklin.html

"Bruce Uttley" wrote in message

In article <47445382$0$25920$>,
Jules wrote:

Hello,

I’m trying to rotate a picture with Photoshop. When I do that with a JPEG picture, I can do 180, 90, -90 degrees or customized. But, when I try to do that with a TIF picture, I can only do 180, 90 or -90 degrees rotations, but not a customized rotation.

Why is the "customized" button locked with a TIF picture ?
Thank you.
Jules

Check the Image Mode of your TIF file. If it’s Grayscale, RGB, … then an arbitrary rotation will be available in CS3. If the mode is Bitmap then arbitrary rotation is not available. It makes sense that an arbitrary rotation is disabled when every pixel has to be either black or white.

make sure you not working in 16 BIT mode
many functions are greyed out
change to 8 bit all should be good to go

KatWoman wrote:

make sure you not working in 16 BIT mode
many functions are greyed out

But not ‘Rotate Arbitrary’.

—
Johan W. Elzenga johan<<at>>johanfoto.nl Editor / Photographer http://www.johanfoto.com