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Photography
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Megapixel problems
drumthumper
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Kansas, United States
Member Since: December 22, 2004
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Posted: Saturday, February 17, 2007 - 02:34 AM UTC
I have been using a Kodak D7590 for about a year and had no issues with it. Suddenly though I have been unable to take 5 megapixel 300dpi images. Everything is shot at 4.4mp and 230dpi .....? Does anybody know why this could be and if there is an inexpensive solution to the problem?

Thanks,
Mike Kirchoff
Bigskip
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England - South East, United Kingdom
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Posted: Saturday, February 17, 2007 - 06:08 AM UTC
Mike

I don't know that particular camera, but mine can only take full 6mp images at ISO100 (what a film speed has to do with a digital camera i don't know), maybe you've changed another setting and it has affected this.

HTH

Andy
Halfyank
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Colorado, United States
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Posted: Saturday, February 17, 2007 - 08:12 AM UTC
My guess who echo Andy's. Have you tried setting all your setting back to default settings?

Grauwolf
#084
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Quebec, Canada
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Posted: Saturday, February 17, 2007 - 08:25 AM UTC
Ahoy Mike,

Try to reset to factory defaults and also do a format on your card. Even though
you erase your card.....sometimes hidden memory accumulates and won't
allow for max res. photos.

Also try a fresh card and see what happens.

Cheers,
Joe

drumthumper
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Kansas, United States
Member Since: December 22, 2004
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Posted: Saturday, February 17, 2007 - 08:30 AM UTC
Rodger,
Yep, I just took a couple of shots at ISO100, as per Andy's advice, and it didn't seem to make any difference. I also had reset everything to default levels once I determined I had a problem, but I still couldn't get any image bigger than 4.4mp and 230dpi. I know it has to be something simple ........

Thanks for the help,
Mike

drumthumper
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Kansas, United States
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Posted: Saturday, February 17, 2007 - 08:41 AM UTC
Well, I re-formatted the card, but it did no good. I removed the card and used the internal memory, but still no improvement I think gremlins have infested my $#@&*^ camera!

Mike
jowady
Member Since: June 12, 2006
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Posted: Saturday, February 17, 2007 - 09:53 PM UTC
Have you tried contacting Kodak? www.kodak.com

John
drumthumper
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Kansas, United States
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Posted: Saturday, February 17, 2007 - 10:17 PM UTC
John,
Yes, I contacted their technical support center. After three phone calls, in which I talked to no less than five different techs, they determined it was my printer! I could not get them to understand I was not even trying to print the images ... I simply could not get anything better than 4.4mp 230dpi from my 5mp camera - period! Perhaps it was a very obvious language issue

Mike (not dissuaded yet) Kirchoff
nzgunnie
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Auckland, New Zealand
Member Since: October 15, 2004
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Posted: Sunday, February 18, 2007 - 09:29 AM UTC
What exactly is telling you that it is 4.4 mp @230 dpi?

DPI is relative to how the image is viewed, what are the dimensions in pixles?

Do you have the image quality and size set to High/Max?
drumthumper
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Kansas, United States
Member Since: December 22, 2004
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Posted: Sunday, February 18, 2007 - 04:13 PM UTC
Phil,
Yes, I believe I have all the settings tuned for a high-resolution image. I reviewed past pics from before I began having problems and when found those were 300dpi. I then checked a few I've taken recently and via each image's properties found those were 2576 x 1932 pixels @ 230dpi. An editor I write for brought this to my attention after I had submitted an article. He stated the photo quality was fine for a small images, but he preferred a larger raw image to work with. I figured it was something I had mistakenly changed on my camera but was too inexperienced to determine exactly what, hence the questions.

Thanks,
Mike
nzgunnie
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Auckland, New Zealand
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Posted: Tuesday, February 20, 2007 - 10:45 AM UTC
Well I have some good news for you, 2576 x 1932=4976832 or 5meg.

To add the '230dpi' to 2576 x 1932 is irrelevent. The image size IS 2576 x 1932 pixels, you can view this at any dpi you choose. I can look at this at 2576 x 1932 pixels @ 72 dpi if I want, the file will contain exactly the same info, and be exactly the same quality, it will just take up more space in inches because the pixles will be less dense (it 72 dots in every inch instead of 300) and this is relative to the program used to view the image.

It is perhaps hard for me to explain clearly, but DPI is only important when specifying an image dimension in cm or inches.

A 6x4 image at 72dpi clearly contains less pixels than a 6x4 image at 300 dpi. In this case there is a huge difference in quality.

But if the image is 2576 x 1932 pixels, how far the computer spreads out these pixles is what determines the image dimensions, NOT how it determines the amount of info (ie quality) of the image.

Here are actual examples using you image size of 2576 x 1932 pixels:

At 300dpi your image is 8.587inches x 6.44 inches.

At 72 dpi your image is 35.778 inches x 26.833 inches.

at 230 dpi your image is 11.2 inches x 8.4 inches.

All these exaplles are the same size file, and the same quality, it is all how the computer displays them.

The key in image quality is the number of pixles. It looks like you have the same number you have always had, just for some reason the computer is only displaying them at 230 dpi instead of 300 dpi. This just means the photo will be shown larger in inches. It is still the same quality.

Why this is happening I am not sure, if you use photoshop it is an easy fix, just go to 'Image'>'Image size'. Deselect 'Resample image' and change the dpi to 300. You will see the pixels stay the same, but the document size changes.





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