Re: Canon EOS-350D
- From: Alan Browne <alan.browne@xxxxxxxxxxxxxxxxxxxxx>
- Date: Sat, 11 Mar 2006 10:44:47 -0500
s-clark wrote:
I am recent entry into the Digital SLR game. I have a EOS 350D. I have the
kit lens which came with the camera. I also have a 28-135mm 3.5-5.6 IS lens.
I have an uncle who has the EOS 20D. And I have a friend who has the Nikon
D50.
I have been struggling with getting the pictures I wanted out of the IS lens.
I seemed to have learned what my mistakes were. Then my friend with the D50
sent me a picture. Man was it crisp. I started looking. If I right click my
JPG in Windows I can view the properties. His camera has a vertical and
horizontal resolution of 300dpi. My 350D and my uncles 20D both have a
resolution of 72dpi. Just for a comparison I looked at my old 3.3 mp Fuji and
found it was also 72dpi.
Irrelvant. These are default "print resolutions" embedded in the information part of the file with the image that have nothing to do with image quality.
To do a good job _before printing_ one does all editing at image "full size" where pixels are pixels and have no dimension (other than as presented on your monitor which is around 90 dpi).
Typically, these days, print resolution is 300 dpi (though 150 is very acceptable, and some printers default to around 400).
What COUNTS is the print size, and so you need to resample the image so that the print size and the print resolution match.
eg: a 4x6 print at 300 dpi required the image to be edited to 1200 x 1800 pixels (4x300 and 6x300) and Un-sharp masked at that resoution for sharpness.
The same image at 8x12, printed at 300 dpi, requires 2400 x 3600. Be sure to "upsample" from the original image and not the one reduced for printing at 4x6! And always Un-sharp-mask at each printed resolution.
Un-sharp maksing is an art unto itself. Be patient. Typically I begin at 100%, 0.4, 2 (sharpening factor, pixels radius and threshold values) and usually I simply manipulate the pixel radius to get to shaprness. View the image at 100% zoom (on an area of in focus detail). If you over do it, "halo" lines will apprear along contasty edges ... you've gone to far, back off.
I hope that helps.
Cheers,
Alan.
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