Distortion after transmision

D
Posted By
daglob
Jan 4, 2008
Views
289
Replies
5
Status
Closed
At my job, we are sending jpeg2000 images to an independent contractor, where they put paths on them and send them back. Once back here, they are processed for use in guiding a laser engraver. For an unknown reason, some, but not all, images come back with a peculiar distortion: the image is stretched slightly on the right hand side as you look at it on the monitor. I can tell this is the case if the image is duplicated across the page, and I need to move a path from one side of the page to another: the path ends up being too short. It means that the laser is guided along a path that does not match up to the image of the original, resulting in a lot of rejects and do-overs. This stretching is not evident just looking at the image on a comptuer; the path from the contractor seems to fit just fine; as I said, I first noticed it when I altered a path and copied it to a duplicate image to the other side of the same page.
It may be that the image is compressed slightly on the left hand side of the image to make up the difference, but I have found no evidence of that. Items done in-house do not have this distortion, so it has to be something that happens after it leaves here, or is part of the conversion from JPG to JPEG2000.
Has anyone else experienced anything like this before?
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J
Joel
Jan 4, 2008
wrote:

At my job, we are sending jpeg2000 images to an independent contractor, where they put paths on them and send them back. Once back here, they are processed for use in guiding a laser engraver. For an unknown reason, some, but not all, images come back with a peculiar distortion: the image is stretched slightly on the right hand side as you look at it on the monitor. I can tell this is the case if the image is duplicated across the page, and I need to move a path from one side of the page to another: the path ends up being too short. It means that the laser is guided along a path that does not match up to the image of the original, resulting in a lot of rejects and do-overs. This stretching is not evident just looking at the image on a comptuer; the path from the contractor seems to fit just fine; as I said, I first noticed it when I altered a path and copied it to a duplicate image to the other side of the same page.
It may be that the image is compressed slightly on the left hand side of the image to make up the difference, but I have found no evidence of that. Items done in-house do not have this distortion, so it has to be something that happens after it leaves here, or is part of the conversion from JPG to JPEG2000.
Has anyone else experienced anything like this before?

You can always ask the "independent contractor" what they have done to the images. Then.

– *If* they say they didn’t do anything then you can use the original images you SENT to them. Or if nothing has changed then I don’t see any reason why you can’t use yours

– *If* they say they made some change then there is the answer.
BJ
Bill Jackson
Jan 5, 2008
They say that they have not altered the image in any way.
J
Joel
Jan 5, 2008
Then you can use your original.
S
samandjanet
Jan 5, 2008
Joel wrote:
Then you can use your original.

Except that the OP said he was sending them to the contractor to have paths added to the Jpegs.
If he uses his originals, they woun’t have those paths.
BJ
Bill Jackson
Jan 6, 2008
On Jan 5, 11:57 am, "\(not quite so\) Fat Sam" wrote:
Joel wrote:
Then you can use your original.

Except that the OP said he was sending them to the contractor to have paths added to the Jpegs.
If he uses his originals, they woun’t have those paths.

Actually, you can drag around and drop those paths on other images. That is how I discovered the distortion: paths from the contractor did not fit the original image-but they were supposed to. They fit the image from the contracotr just fine. By the way, it is a left to right distortion, not a top to bottom distortion, or I might consider that the scanner was dragging.

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