Is it possible to and how do I do this with photoshop or rawshooter 2006?
Thanks!!
Posted by David Bostedo on December 7, 2007 at 5:29 PM
Kyle - Sure - this is easily done in Photoshop with the crop tool, or changing the image size (from the Image menu in Elements - not sure about CS3). There are free programs that can change it as well. Photoshop makes it easy and if you need to change the number of pixels in the image by growing it (known as upressing) there are a couple of algorithms available in the Image Size dialog.
The question, though, is why do you care about it? If it's for printing, and you have a specification that's something like "10"x8" at 300dpi", then it's just a different way of specifying the resolution. In this case, it would mean the file should be 3000 pixels by 2400 pixels. (Yes, that's actually ppi, but they are pretty interchangable in most uses.)
If you aren't concerned about printing (in which case the printer/print driver cares) then dpi is meaningless.
Yep...this is for printing. My rawshooter changes raw files into tiff files at 300 ppi though, does that do it for me even though i'm opening it into photoshop for further image adjustment but not any resizing??
Posted by David Bostedo on December 7, 2007 at 5:55 PM
I think Photoshop would read the TIFF settings the same way, but I don't have RawShooter....you can check by opening the Image Size dialog (CTRL-ALT-i in Windows I think) and seeing what it is currently set to when you open an image. You'll see pixel dimensions at the top, and below it should be physical measurements and ppi.
Posted by David Senesac on December 7, 2007 at 6:30 PM
Inages are usually sized by default to 72 ppi from digital cameras since that is the old commercial print standard. If one opens such an image in Photoshop with the Ruler bar active and set to inches, the result at 100% zoom will display inches smaller than one inch physically on the screen. Something that annoys me so any digital pics I edit, I bother to also change that print pixel pitch to 96 ppi that is approximately one inch on my monitor like it is on most other users monitors. I of course have no interest in printing at that crude pitch but rather it serves as a familiar way to display images on my monitor in Photoshop than setting the Information Ruler option to use more abstract for me pixels. For actual image print files I leave them at their print pixel settings. For instance for Lightjet prints that is 200 pixel per centimeter (304.8 ppi). ...David
From above "Inages [sic] are usually sized by default to 72 ppi from digital cameras since that is the old commercial print standard."
Not certain, but when were old commercial typesetters only 72 dpi? Back in the early 80's when I worked for an oil company in the oil production research center, we replaced our typesetter after a lightning strike on an adjacent building. If memory serves me correctly, it was either 144 or 288 dpi. I believe it was manufactured by Linotype. But as I was into engineering, I am not certain about the specifics, in particular the manufacturer. However, I do know the resolution was significantly greater than 72 dpi as it was used for producing camera ready pages to be printed. It was also used for four-color separations. The only thing that crude must have either been for draft or for newsprint.
Posted by David Bostedo on December 9, 2007 at 12:26 PM
Actually, my camera's default is 180 ppi. I have no idea why.
Discussion
7 repliesThanks!!
The question, though, is why do you care about it? If it's for printing, and you have a specification that's something like "10"x8" at 300dpi", then it's just a different way of specifying the resolution. In this case, it would mean the file should be 3000 pixels by 2400 pixels. (Yes, that's actually ppi, but they are pretty interchangable in most uses.)
If you aren't concerned about printing (in which case the printer/print driver cares) then dpi is meaningless.
Not certain, but when were old commercial typesetters only 72 dpi? Back in the early 80's when I worked for an oil company in the oil production research center, we replaced our typesetter after a lightning strike on an adjacent building. If memory serves me correctly, it was either 144 or 288 dpi. I believe it was manufactured by Linotype. But as I was into engineering, I am not certain about the specifics, in particular the manufacturer. However, I do know the resolution was significantly greater than 72 dpi as it was used for producing camera ready pages to be printed. It was also used for four-color separations. The only thing that crude must have either been for draft or for newsprint.