Weird pixel movements at 75% and 150% zoom.

[ved sharma]

Hello,

I see this weird pixel movements in the my images and I wanted to check if other people also see it? Open the attached 16-bit image, change zoom to either 75% or 150%. Draw an roi somewhere in the image and then click outside the roi. During this last mouse press and release, I see image pixels moving diagonally in the whole image. I don't see this effect at any other zoom setting.

I'm running Imagej 1.45k, on a Windows 7 machine.

Ved

[John Oreopoulos]

I tried it and I don't see the effect you described. Mac OS X 10.6.7, version 1.45l8.

John Oreopoulos
Research Assistant
Spectral Applied Research
Richmond Hill, Ontario
Canada
www.spectral.ca


On 2011-07-21, at 6:35 PM, Ved Sharma wrote:

> Hello,
>
> I see this weird pixel movements in the my images and I wanted to check if other people also see it? Open the attached 16-bit image, change zoom to either 75% or 150%. Draw an roi somewhere in the image and then click outside the roi. During this last mouse press and release, I see image pixels moving diagonally in the whole image. I don't see this effect at any other zoom setting.
>
> I'm running Imagej 1.45k, on a Windows 7 machine.
>
> Ved
> <test_image.tif>

[Jacqueline Ross]

Hi Ved,

I saw the effect on my computer (Windows XP, IJ 1.45e) although I haven't noticed it before. Maybe I don't normally use these zoom settings. Certainly, I don't usually go above 100% display.

But I would describe it as a "blink" (or flinch), where the pixels shift (about one pixel on my system) and then return to their correct position.

So, I think it's just something to do with refreshing the display after deactivating the ROI.

Kind regards,

Jacqui

Jacqueline Ross

Biomedical Imaging Microscopist
Biomedical Imaging Research Unit
School of Medical Sciences
Faculty of Medical & Health Sciences
The University of Auckland
Private Bag 92019
Auckland, NEW ZEALAND

Tel: [phone] Ext 87438
Fax: [phone]

http://www.fmhs.auckland.ac.nz/sms/biru/


-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of John Oreopoulos
Sent: Friday, 22 July 2011 10:56 a.m.
To: [hidden email]
Subject: Re: Weird pixel movements at 75% and 150% zoom.

I tried it and I don't see the effect you described. Mac OS X 10.6.7, version 1.45l8.

John Oreopoulos
Research Assistant
Spectral Applied Research
Richmond Hill, Ontario
Canada
www.spectral.ca


On 2011-07-21, at 6:35 PM, Ved Sharma wrote:

> Hello,
>
> I see this weird pixel movements in the my images and I wanted to check if other people also see it? Open the attached 16-bit image, change zoom to either 75% or 150%. Draw an roi somewhere in the image and then click outside the roi. During this last mouse press and release, I see image pixels moving diagonally in the whole image. I don't see this effect at any other zoom setting.
>
> I'm running Imagej 1.45k, on a Windows 7 machine.
>
> Ved
> <test_image.tif>

[Jacqueline Ross]

Hi Ved,

Just updated my ImageJ to version 4.2l (same version as John) and the effect has gone.

Kind regards,

Jacqui

Jacqueline Ross

Biomedical Imaging Microscopist
Biomedical Imaging Research Unit
School of Medical Sciences
Faculty of Medical & Health Sciences
The University of Auckland
Private Bag 92019
Auckland, NEW ZEALAND

Tel: [phone] Ext 87438
Fax: [phone]

http://www.fmhs.auckland.ac.nz/sms/biru/


-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Jacqui Ross
Sent: Friday, 22 July 2011 11:18 a.m.
To: [hidden email]
Subject: Re: Weird pixel movements at 75% and 150% zoom.

Hi Ved,

I saw the effect on my computer (Windows XP, IJ 1.45e) although I haven't noticed it before. Maybe I don't normally use these zoom settings. Certainly, I don't usually go above 100% display.

But I would describe it as a "blink" (or flinch), where the pixels shift (about one pixel on my system) and then return to their correct position.

So, I think it's just something to do with refreshing the display after deactivating the ROI.

Kind regards,

Jacqui

Jacqueline Ross

Biomedical Imaging Microscopist
Biomedical Imaging Research Unit
School of Medical Sciences
Faculty of Medical & Health Sciences
The University of Auckland
Private Bag 92019
Auckland, NEW ZEALAND

Tel: [phone] Ext 87438
Fax: [phone]

http://www.fmhs.auckland.ac.nz/sms/biru/


-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of John Oreopoulos
Sent: Friday, 22 July 2011 10:56 a.m.
To: [hidden email]
Subject: Re: Weird pixel movements at 75% and 150% zoom.

I tried it and I don't see the effect you described. Mac OS X 10.6.7, version 1.45l8.

John Oreopoulos
Research Assistant
Spectral Applied Research
Richmond Hill, Ontario
Canada
www.spectral.ca


On 2011-07-21, at 6:35 PM, Ved Sharma wrote:

> Hello,
>
> I see this weird pixel movements in the my images and I wanted to check if other people also see it? Open the attached 16-bit image, change zoom to either 75% or 150%. Draw an roi somewhere in the image and then click outside the roi. During this last mouse press and release, I see image pixels moving diagonally in the whole image. I don't see this effect at any other zoom setting.
>
> I'm running Imagej 1.45k, on a Windows 7 machine.
>
> Ved
> <test_image.tif>

[ved sharma]

Updating to 1.45l does not help.

On another machine, I've Windows XP, IJ 1.45d, and I don't see this pixel movement. Seems to me that it is specific to Windows 7. Any Windows 7 users would like to test and report?

Ved

[Jacqueline Ross]

Sorry Ved,

I think I must have forgotten to go back to the same zoom. I still have the issue (Windows XP).

Kind regards,

Jacqui

Jacqueline Ross

Biomedical Imaging Microscopist
Biomedical Imaging Research Unit
School of Medical Sciences
Faculty of Medical & Health Sciences
The University of Auckland
Private Bag 92019
Auckland, NEW ZEALAND

Tel: [phone] Ext 87438
Fax: [phone]

http://www.fmhs.auckland.ac.nz/sms/biru/


-----Original Message-----
From: ImageJ Interest Group [mailto:[hidden email]] On Behalf Of Ved Sharma
Sent: Friday, 22 July 2011 1:55 p.m.
To: [hidden email]
Subject: Re: Weird pixel movements at 75% and 150% zoom.

Updating to 1.45l does not help.

On another machine, I've Windows XP, IJ 1.45d, and I don't see this pixel movement. Seems to me that it is specific to Windows 7. Any Windows 7 users would like to test and report?

Ved

[Carole Force]

Hi Ved,

I have image j 1.44 p on Windows XP. I have opened your image, I zoomed it at 150 % and I drew a selection. When I clicked outside the selection, I have observed the image moving. As Jacqui told it, I think it is just a "blink" because when I zoom to 2400% in order to see each pixel and when I draw a selection and click outside, the pixels don't move.
Try to the zoom 2400%.

kind regards.

Carole Force.

[ved sharma]

Yes, it is just a "blink" of pixels across the whole image. You will not see it at 2400% zoom. It's only zoom 150% and 75% which show this effect.

Just found that, if I open the image using Image5D, zoom it to 150% or 75% and click on the image, I see the same effect. No need to even draw the roi.

Ved