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FORUMS Canon Cameras, Lenses & Accessories Canon EOS Digital Cameras 
Thread started 03 Jan 2013 (Thursday) 16:55
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Squares on image

 
rich225
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Jan 03, 2013 16:55 |  #1

Hi all,

I have just noticed when zooming into my images shot on a 60D at 200% I have weird square type things, not sure how else to describe them. Is this normal?

I have opened the images on Digital Photo Professional and it seems to be there, it also seems to be there on the camera viewfinder. However when I import the RAW file into Photoshop the weird squares are not there.

Does anyone have any ideas?

I have attached an image to show you what I mean.

Thank You, I really appreciate your help


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ebjo
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Jan 03, 2013 17:22 |  #2
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Are you zooming in on a jpeg file at 200%. A jpeg has not much detail in it so enlarging messes it up, called the jaggies. Your raw file has way more detail in it, so it can be enlarged quite a bite and still be sharp.


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rich225
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Jan 03, 2013 17:30 as a reply to  @ ebjo's post |  #3

It is a RAW file that I am zooming in on, you can see them in Digital Photo Professional even zoomed out on black backgrounds. They seem to be on different images in different places.




  
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ebjo
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Jan 03, 2013 17:46 |  #4
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Ok, that is strange. Time for a photo guru to come up with an answer.


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rich225
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Jan 03, 2013 17:59 as a reply to  @ ebjo's post |  #5

Thank you ebjo,

Do you think it could be dust on the sensor?




  
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rrblint
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Jan 03, 2013 18:16 as a reply to  @ rich225's post |  #6

Hard to tell on your attached image, but probably just pixilation.

http://en.wikipedia.or​g/wiki/Pixelation (external link)


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yogestee
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Jan 03, 2013 19:49 as a reply to  @ rrblint's post |  #7

Dead pixel?


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Demazi
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Jan 03, 2013 20:10 |  #8

Doesn't look like pixelation and dead pixels are always in the same spot.




  
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shaftmaster
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Jan 03, 2013 22:50 |  #9

When I zoom in on the OP's attached image, the "weird square type things" look like the 3x3 checkerboard icon (like a tic tac toe game) that Canon uses for the Index function button that is used to display 9 images on the back LCD at the same time.

EDIT: ok, took a second look and now I think the 3x3 checkerboard is just the DPP cursor when zoomed to 200%. assuming that's true, then the squares are probably just pixelation as mentioned earlier.

EDIT 2: and when the OP says "it also seems to be there on the camera viewfinder", I assume he means the back LCD.


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kylekruchok
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Jan 04, 2013 00:30 |  #10

It's a hot-pixel.

Not a dead pixel.

Sometimes pixels act up when gathering photons, due to static / etc... and they twitch out, releasing electrons into other nearby photocells, tricking the neighbors into thinking that they're actually gathering light.

I had these all over my 7D - they're rarely in the same place for two images in a row (though, if you have ten, chances are - there may be some images where the "x" or "+" is in the same spot).


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TSchrief
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Jan 04, 2013 01:54 |  #11
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Hot/dead pixels do NOT show up in the viewfinder. Ever.


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Keyan
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Jan 04, 2013 04:52 |  #12

rich225 wrote in post #15440642 (external link)
Hi all,

I have just noticed when zooming into my images shot on a 60D at 200% I have weird square type things, not sure how else to describe them. Is this normal?

I have opened the images on Digital Photo Professional and it seems to be there, it also seems to be there on the camera viewfinder. However when I import the RAW file into Photoshop the weird squares are not there.

Does anyone have any ideas?

I have attached an image to show you what I mean.

Thank You, I really appreciate your help

I assume you mean the back LCD when zoomed in, not the viewfinder.

These are hot pixels. Adobe must be doing some filtering and removing them in their RAW converter. If you have one or two in the same spot that show up regardless of ISO and lighting there is a trick to removing them, if they are totally random it is just part of the noise pattern you pick up with a digital sensor.


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Gregg.Siam
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Jan 04, 2013 08:06 as a reply to  @ Keyan's post |  #13

Do you have a less cropped version? I'd like to see the big picture so to speak.


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mike_311
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Jan 04, 2013 08:11 |  #14

Gregg.Siam wrote in post #15442936 (external link)
Do you have a less cropped version? I'd like to see the big picture so to speak.

same here, i can't open the image you place in the thread.


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TSchrief
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Jan 04, 2013 08:15 |  #15
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Keyan wrote in post #15442610 (external link)
I assume you mean the back LCD when zoomed in, not the viewfinder.

These are hot pixels. Adobe must be doing some filtering and removing them in their RAW converter. If you have one or two in the same spot that show up regardless of ISO and lighting there is a trick to removing them, if they are totally random it is just part of the noise pattern you pick up with a digital sensor.

IF they are hot pixels, and IF OP is talking about rear-LCD instead of viewfinder, they can be mapped out by:

Remove lens.
Install body cap.
Set camera to "Manually Clean Sensor"
Set camera down for 10 minutes.
Shut camera off.
Remove battery.
Set camera down for 30 minutes.

End of process. Re-install battery. Shoot. If they were hot pixels, they have been mapped out and won't show up again. Until the next ones show up. I had them on my T1i. Mine were all pure 255 red.


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Squares on image
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