Quoting Mark Roberts <[email protected]>:
Eric Weir wrote:
I've had a request that I send an image that's at least 300 dpi.
I have an image shot at 1/180 at ISO 400.
Uh oh. This sounds like a request from someone who doesn't know what
they're talking about.
Yeah. I regularly get requests from people to use some of my
wildflower photos in a printed publication and they will almost
invariably say "a resolution of 300dpi will be good".
As others have said, any image can be 300 dpi but, depending on the
pixel dimensions of the image, the final printed size can be very
small or very large.
A 6 MP image (3000 x 2000 pixels) will produce an image of about 10in
x 6.7in (3000/300 x 2000/300). But if the image is resized to 1500 x
1000 pixels, the print will be about 5in x 3.3in (1500/300 x 1000/300)
at 300dpi.
So, what I usually do is ask what size (approximately) are they aiming
to print. Then I can work back to find what resizing of the original
image is needed to produce that printed size at 300dpi.
Cheers
Brian
++++++++++++++++++++++++++++++++++
Brian Walters
Western Sydney Australia
http://lyons-ryan.org/southernlight/
Output resolution (which is in pixels per inch,
not dots per inch) is independent of image dimensions (in pixels). You
need to ask them for either the pixel dimensions they want (which they
probably won't know) of what their intended print size is (in inches
or centimeters).
I have LR 3. Is there a way in it to determine the resolution/dpi ---
I'm assuming they are equivalent---of an image? Is there a way to
control the resolution/dpi when exporting the image?
You can control everything in the Export dialog. The parts of the
Export dialog are as follows (scrolling from top to bottom):
* Export location
* File Naming
* Video
* File settings (file format, color space, bit depth, etc.)
* Image sizing
* Sharpening
* Metadata
* Watermarking
* Post-processing
The first two items are at your own discretion. The third is
non-applicable.
File settings should, unless the recipient specifies otherwise, be
JPEG file format, sRGB color space, high quality (how high is up to
you)
Image sizing is where you set parameters for the pixel dimensions of
your exported image. You know that the output resolution needs to be
300 ppi (though it really doesn't matter - the recipient can change it
to any value they like) but you don't know what actual dimensions in
pixels or inches are required. This is the information you need to get
from the person you're sending the image to.
(I'd leave sharpening off and skip the Metadata, Watermarking and
Post-processing sections for this.)
--
Mark Roberts - Photography & Multimedia
www.robertstech.com
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