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D60 pixellated blue sky

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Simon Tate

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Richmond, UK
Greetings all!

New user here with a D60 & a curious problem.

Took about 6 images last week & all show a strangely pixellated sky. Sun was behind me & shots were taken at 100 ISO with Canon 28-80 L lens (1/90 at f8). Have not seen the problem either before or after...though admittedly clear blue skies are something of a rarity in the UK at this time of year!! Any ideas? Pixellation is odd as it is uneven - clumps or blocks of pixels which produces a sort of tide mark effect when printed.

Yours thoughts would be appreciated.

Images can be found at:

http://web.onetel.net.uk/~thetates/

& will need to be opened in Photoshop at 100% to see the effect

Simon Tate (UK)
 
This is not an original pic. There is a lack of a full range of colors giving the pixelation appearance. Either this is caused by jpg compression or some kind of color conversion. You need to review the entire procedure used to create this picture. A blue sky with gradual changes is a real challange for compression or conversion software. Problems usually show up in solid or almost solid colors. Good luck,

Rich
 
Hi Rich

Not entirely sure what u mean. The image was taken as large JPEG as opposed to RAW, but the image posted is as it was downloaded from camera. Has not been altered in Photoshop.

Regards, Simon
RichW said:
This is not an original pic. There is a lack of a full range of
colors giving the pixelation appearance. Either this is caused by
jpg compression or some kind of color conversion. You need to
review the entire procedure used to create this picture. A blue
sky with gradual changes is a real challange for compression or
conversion software. Problems usually show up in solid or almost
solid colors. Good luck,

Rich
Click to expand...
--
Simon Tate (UK)
 
Do you know what jpg compression level setting you had when you took the image?
Simon Tate said:
Not entirely sure what u mean. The image was taken as large JPEG as
opposed to RAW, but the image posted is as it was downloaded from
camera. Has not been altered in Photoshop.

Regards, Simon
RichW said:
This is not an original pic. There is a lack of a full range of
colors giving the pixelation appearance. Either this is caused by
jpg compression or some kind of color conversion. You need to
review the entire procedure used to create this picture. A blue
sky with gradual changes is a real challange for compression or
conversion software. Problems usually show up in solid or almost
solid colors. Good luck,

Rich
Click to expand...
--
Simon Tate (UK)
Click to expand...
 
This pic is filled with compression artifacts! You can see it in the branches in the tree and the probems in the sky! This can't be large/fine jpg straight from the camera. Recheck your camera settings. Check the Exif info of the pic. There is none available in your posted pic. Something is really wrong here.

Rich
Simon Tate said:
Not entirely sure what u mean. The image was taken as large JPEG as
opposed to RAW, but the image posted is as it was downloaded from
camera. Has not been altered in Photoshop.

Regards, Simon
RichW said:
This is not an original pic. There is a lack of a full range of
colors giving the pixelation appearance. Either this is caused by
jpg compression or some kind of color conversion. You need to
review the entire procedure used to create this picture. A blue
sky with gradual changes is a real challange for compression or
conversion software. Problems usually show up in solid or almost
solid colors. Good luck,

Rich
Click to expand...
--
Simon Tate (UK)
Click to expand...
 
File size looks a bit small.... most of my shots are between 2-4mb rather than the 539kb of your image.

Did you load the picture into photoshop then save? Each save into jpg will lose more data and show more artifacts which could explain it.

Mark.
Simon Tate said:
Not entirely sure what u mean. The image was taken as large JPEG as
opposed to RAW, but the image posted is as it was downloaded from
camera. Has not been altered in Photoshop.

Regards, Simon
RichW said:
This is not an original pic. There is a lack of a full range of
colors giving the pixelation appearance. Either this is caused by
jpg compression or some kind of color conversion. You need to
review the entire procedure used to create this picture. A blue
sky with gradual changes is a real challange for compression or
conversion software. Problems usually show up in solid or almost
solid colors. Good luck,

Rich
Click to expand...
--
Simon Tate (UK)
Click to expand...
 
You did a lossy rotate, which caused this compressed mess.

Jason
Simon Tate said:
Greetings all!

New user here with a D60 & a curious problem.

Took about 6 images last week & all show a strangely pixellated
sky. Sun was behind me & shots were taken at 100 ISO with Canon
28-80 L lens (1/90 at f8). Have not seen the problem either before
or after...though admittedly clear blue skies are something of a
rarity in the UK at this time of year!! Any ideas? Pixellation is
odd as it is uneven - clumps or blocks of pixels which produces a
sort of tide mark effect when printed.

Yours thoughts would be appreciated.

Images can be found at:

http://web.onetel.net.uk/~thetates/

& will need to be opened in Photoshop at 100% to see the effect

Simon Tate (UK)
Click to expand...
 
Camera settings are confirmed by Exif info. Large/fine setting at 100 ISO. Standard parameters. Absolutely no changes made in PS - this image is straight from camera. I took 5 others at around the same time & all show same effect. Took images of sunset later in day & no sign whatsoever of pixellation with camera settings unaltered apart from exposure. Have e-mailed image to Canon & await their reply.
--
Simon Tate (UK)
 
The edited EXIF and messed up thumbnail give it away!

Jason
Simon Tate said:
Camera settings are confirmed by Exif info. Large/fine setting at
100 ISO. Standard parameters. Absolutely no changes made in PS -
this image is straight from camera. I took 5 others at around the
same time & all show same effect. Took images of sunset later in
day & no sign whatsoever of pixellation with camera settings
unaltered apart from exposure. Have e-mailed image to Canon & await
their reply.
--
Simon Tate (UK)
Click to expand...
 
What EXIF info? What thumbnail? Now the picture is unavailable! Wonder how this will end? :)

Rich
Jason Hutchinson said:
Jason
Simon Tate said:
Camera settings are confirmed by Exif info. Large/fine setting at
100 ISO. Standard parameters. Absolutely no changes made in PS -
this image is straight from camera. I took 5 others at around the
same time & all show same effect. Took images of sunset later in
day & no sign whatsoever of pixellation with camera settings
unaltered apart from exposure. Have e-mailed image to Canon & await
their reply.
--
Simon Tate (UK)
Click to expand...
Click to expand...
 
The exif is in the JPG. Your browser may not let you save the original JPG. The thumbnail is also embedded in the JPG.

Jason
RichW said:
Rich
Jason Hutchinson said:
Jason
Simon Tate said:
Camera settings are confirmed by Exif info. Large/fine setting at
100 ISO. Standard parameters. Absolutely no changes made in PS -
this image is straight from camera. I took 5 others at around the
same time & all show same effect. Took images of sunset later in
day & no sign whatsoever of pixellation with camera settings
unaltered apart from exposure. Have e-mailed image to Canon & await
their reply.
--
Simon Tate (UK)
Click to expand...
Click to expand...
Click to expand...
 
It was a setting in IE 6 that has now allowed me to save in JPG. The small size and overall condition indicate it has been highly compressed. I don't think the camera can do this. The story continues...

Rich
Jason Hutchinson said:
The exif is in the JPG. Your browser may not let you save the
original JPG. The thumbnail is also embedded in the JPG.

Jason
Click to expand...
 
Jason Hutchinson said:
The edited EXIF and messed up thumbnail give it away!
Click to expand...
Hey...I may be new to DPReview but I am not a complete digital virgin. THE IMAGE IS STRAIGHT FROM THE CAMERA!!!! That's it!! No plot to deceive Canon ....just an aberarrant set of pics for which I am trying to find an answer. The EXIF info is not with the pic because of the way it was upoladed to the web site. IT HAS NOT BEEN IN ANYWAY ALTERED....PERIOD!!!
Jason Hutchinson said:
Jason
Simon Tate said:
Camera settings are confirmed by Exif info. Large/fine setting at
100 ISO. Standard parameters. Absolutely no changes made in PS -
this image is straight from camera. I took 5 others at around the
same time & all show same effect. Took images of sunset later in
day & no sign whatsoever of pixellation with camera settings
unaltered apart from exposure. Have e-mailed image to Canon & await
their reply.
--
Simon Tate (UK)
Click to expand...
Click to expand...
--
Simon Tate (UK)
 
What did you use to download and rotate the pic?

If you used photoshop to rotate it and then save it, perhaps PS defaulted to a high compresstion ratio for the jpeg.
Jason Hutchinson said:
Jason
Simon Tate said:
Greetings all!

New user here with a D60 & a curious problem.

Took about 6 images last week & all show a strangely pixellated
sky. Sun was behind me & shots were taken at 100 ISO with Canon
28-80 L lens (1/90 at f8). Have not seen the problem either before
or after...though admittedly clear blue skies are something of a
rarity in the UK at this time of year!! Any ideas? Pixellation is
odd as it is uneven - clumps or blocks of pixels which produces a
sort of tide mark effect when printed.

Yours thoughts would be appreciated.

Images can be found at:

http://web.onetel.net.uk/~thetates/

& will need to be opened in Photoshop at 100% to see the effect

Simon Tate (UK)
Click to expand...
Click to expand...
 
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