Converting RAW files to make exposure value changes at high resolution
Posted 10/02/2010 - 12:09
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The dpi setting does not actually change the image resolution when using the Pentax program.
The dpi setting is just saved as a number in the Exif info in the JPEG file - which other programs and devices may or may not do something with.
The dpi setting is just saved as a number in the Exif info in the JPEG file - which other programs and devices may or may not do something with.
~Pete
Posted 10/02/2010 - 15:40
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The dpi number is only significant when you print an image (relates to the printer's dpi).
Best regards
Terry
K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
Terry
K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
Posted 10/02/2010 - 15:43
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ppi (pixels per inch) relates to the image. dpi (dots per inch) relates to the printer output. These terms regularly get confused...
Best regards, John
Posted 10/02/2010 - 15:48
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You are of course correct, John, but is it not true that pixels in the image (ppi) translate to dots (dpi) in the printer?
Best regards
Terry
K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
Terry
K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
Posted 10/02/2010 - 16:12
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What I wrote above applies also to ppi for the Pentax program.
The terms ppi and dpi are often confused even by software developers.
The terms ppi and dpi are often confused even by software developers.
~Pete
Posted 10/02/2010 - 16:14
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terje-l wrote:
You are of course correct, John, but is it not true that pixels in the image (ppi) translate to dots (dpi) in the printer?
No.
You are of course correct, John, but is it not true that pixels in the image (ppi) translate to dots (dpi) in the printer?
~Pete
Posted 10/02/2010 - 16:20
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Quote:
You are of course correct, John, but is it not true that pixels in the image (ppi) translate to dots (dpi) in the printer?
No again! If each pixel was represented by one dot of ink that would be a pretty lousy image! When I print, the colour of 300 pixels is made up of 2880 dots of ink. This results in a rather better print!
You are of course correct, John, but is it not true that pixels in the image (ppi) translate to dots (dpi) in the printer?
Best regards, John
Posted 10/02/2010 - 19:13
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Back to the OP, providing the image size (x pixels by y pixels) remains the same, forget the ppi, dpi etc. and go ahead and process your files.
K.
K.
Kris Lockyear
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.
It is an illusion that photos are made with the camera… they are made with the eye, heart and head. Henri Cartier-Bresson
Lots of film bodies, a couple of digital ones, too many lenses (mainly older glass) and a Horseman LE 5x4.
Posted 10/02/2010 - 21:58
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johnriley wrote:
No again! If each pixel was represented by one dot of ink that would be a pretty lousy image! When I print, the colour of 300 pixels is made up of 2880 dots of ink. This results in a rather better print!
Ok. I think I understand now. An image of, say, 3000 x 2400 pixels at 300 ppi (pixels per inch) will make a 10" x 8" print on paper. The printer's dpi determines how many dots the printer will use to create one pixel of the image. (At least that's what I see on my own printer).No again! If each pixel was represented by one dot of ink that would be a pretty lousy image! When I print, the colour of 300 pixels is made up of 2880 dots of ink. This results in a rather better print!
But until the image is printed, it remains a 3000 x 2400 pixels image, the ppi doesn't matter.
Best regards
Terry
K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
Terry
K20D, Optio I10, DA 18-55 1:3.5-5.6 AL II, A 1:1.7/50, D FA 1:2.8/100 Macro, Sigma 70-300 1:4-5.6 APO DG Macro, Pentax AF 360FGZ
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62 posts
16 years
Totnes
I have wanted to use it for changing the exposure values, to create a pseudo-HDR image in Photomatix Pro (where there is significant movement in the image, making it not possible to take multiple exposures without 'ghosting').
When I save the JPEG it ends up being saved at 72dpi, rather than the 300dpi that the RAW file was. Can't seem to work out how to save it at a higher resolution....
Cheers