Tiff image rotation problems

[Guy Godwin]

Hi
 
I am fairly new to using ImageJ and have tried using the Image->rotate->Rotate 90 degrees to left on a tiff image that I have scanned in.  Unfortunately when the image is rotated I get a whole lot of diagonal lines.  The crazy part is when I put a line profile on the rotated (distorted) image I get the profile that looks similar to what I would expect if the image wasn't distorted.  I am running ImageJ 1.40g.
 
Hope someone can help as I am totally at a loss.
 
Regards
Guy


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[Joachim Wesner]

This is very uncommon behaviour, and should affect ALL images under Imagej,
as the rotation is done
independent off the input file. Never seen this, looks more like a bug in
the windowing subsystem or graphics
hardware, as you also say that the line profile is OK What happens if you
refresh the window (put it in back/
foreground, hide/unhide)!!??

JW

ImageJ Interest Group <[hidden email]> schrieb am 15.05.2008 00:26:45:

> Hi
>
> I am fairly new to using ImageJ and have tried using the
> Image->rotate->Rotate 90 degrees to left on a tiff image that I have
> scanned in.  Unfortunately when the image is rotated I get a whole
> lot of diagonal lines.  The crazy part is when I put a line profile
> on the rotated (distorted) image I get the profile that looks
> similar to what I would expect if the image wasn't distorted.  I am
> running ImageJ 1.40g.
>
> Hope someone can help as I am totally at a loss.
>
> Regards
> Guy
>
>

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[Stephan Preibisch]

Hi,

are these artefacts still there when you zoom the image to 100%? If not,
these artefacts are most likely due to the interpolation scheme ImageJ
uses to display images at different magnifications (75%, 50%, ...)

All the best,
Stephan

> Hi
>
> I am fairly new to using ImageJ and have tried using the
> Image->rotate->Rotate 90 degrees to left on a tiff image that I have
> scanned in.  Unfortunately when the image is rotated I get a whole lot of
> diagonal lines.  The crazy part is when I put a line profile on the
> rotated (distorted) image I get the profile that looks similar to what I
> would expect if the image wasn't distorted.  I am running ImageJ 1.40g.
>
> Hope someone can help as I am totally at a loss.
>
> Regards
> Guy
>
>
> ********************************************************************************
> This email, including any attachments sent with it, is confidential and
> for the sole use of the intended recipient(s). This confidentiality is not
> waived or lost, if you receive it and you are not the intended
> recipient(s), or if it is transmitted/received in error.
> Any unauthorised use, alteration, disclosure, distribution or review of
> this email is strictly prohibited.  The information contained in this
> email, including any attachment sent with it, may be subject to a
> statutory duty of confidentiality if it relates to health service matters.
> If you are not the intended recipient(s), or if you have received this
> email in error, you are asked to immediately notify the sender by
> telephone collect on Australia [phone] or by return email.  You
> should also delete this email, and any copies, from your computer system
> network and destroy any hard copies produced.
> If not an intended recipient of this email, you must not copy, distribute
> or take any action(s) that relies on it; any form of disclosure,
> modification, distribution and/or publication of this email is also
> prohibited.
> Although Queensland Health takes all reasonable steps to ensure this email
> does not contain malicious software, Queensland Health does not accept
> responsibility for the consequences if any person's computer inadvertently
> suffers any disruption to services, loss of information, harm or is
> infected with a virus, other malicious computer programme or code that may
> occur as a consequence of receiving this email.
> Unless stated otherwise, this email represents only the views of the
> sender and not the views of the Queensland Government.
> **********************************************************************************
>

[Wayne Rasband]

> I am fairly new to using ImageJ and have tried using the
> Image->rotate->Rotate 90 degrees to left on a tiff image that I have
> scanned in.  Unfortunately when the image is rotated I get a whole lot
> of diagonal lines.  The crazy part is when I put a line profile on the
> rotated (distorted) image I get the profile that looks similar to what
> I would expect if the image wasn't distorted.  I am running ImageJ
> 1.40g.

This is a problem with large composite color images (e.g., 48-bit
TIFFs). I can reproduce it by opening the "M51 Galaxy (116K, RGB)"
sample image, using the Image>Color>Make Composite command, and then
the Image>Rotate>90 Degrees Right command. You can get the rotated
image to display correctly by moving the channel selection slider under
the image. I hope to have a fix for this problem in the next day or
two.

-wayne

[Guy Godwin]

Thanks to all for your help.  Following on from Joachim email I noted I could get the real image by 'duplicating' the rotated image.  I look forward to the fix.
 
Regards
Guy


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