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Learning
Center Article -
The Facts on Digital
Photo Resolution and Photo Enlargement Printing
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By: Mike Kruske
Director - Technical Services / Operations
PhotoArt Imaging Digital Arts Center
(Questions or comments
call customer service - 877 284-1265)
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Most people are aware of the
term resolution in regards to digital photos. If nothing
else, they know the megapixel rating of their camera,
which is basically the camera's resolution. The resolution
of a digital photo is simply the pixel dimensions of the
photo. A digital photo's pixel dimensions are the
determining factor in how large it can be printed and
still maintain the original image quality of the
photograph.
When a digital image is printed, it should have a
resolution of 300ppi (pixels per inch) at the target
output size of the print. This figure of 300ppi simply has
to do with the optical perception of the human eye. At
this 300ppi the human eye can't detect the image pixel
lines. As the resolution becomes smaller and smaller, the
pixel lines become more evident, increasingly getting the
"pixelated" appearance most people are aware of.
Increasing the resolution of a digital image through
software will not improve image sharpness or detail. The
sharpness and image detail will basically never be better
than it is in the original image capture at the given
resolution of the capture device, such as a digital
camera. Think of resolution as a screen applied over the
optical image at the time of capture. The higher the
native or natural resolution of the capture device, the
finer this screen mesh will be and the higher the
resolution.
Increasing the native resolution of an image using
software will actually degrade the original photo quality.
The software will use image averaging techniques when
increasing the resolution, which will never result in a
finer quality visual appearance. The software has to
"make up" areas of the image when building new
pixels, which will never be as clear and precise as the
actual light generated image characteristics. This fact is
considering the use of standard over the counter image
editing software such as Photoshop.
When sending a digital photo for professional photo
enlargement printing, you should send the original
resolution photo right from the digital camera. If you
have made enhancements to the photo such as adjustments to
the levels, curves, brightness or contrast, color
saturation or whatever adjustments you use, this will not
change the original image resolution.
The best way to build image resolution to the 300ppi level
at the print output target size is to let our highly
advanced software systems perform the digital photo
processing. We use a two or three step digital photo
processing method that will yield absolute original photo
quality at whatever target photo enlargement printing
size, and the image will print at 360ppi.
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The
Facts on Digital Photo Resolution and Photo
Enlargement Printing
read more... |
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FREE...
Digital Photo
Customer Services
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- Photo Enlargement
- Photo Cropping
- Photo Sizing
- Photo Enhancements
tonal levels
brightness/contrast
color saturation
adjust sharpness
- Photo Retouching
- Digital Photo
Analysis
- Technical Support
- Project Assistance
- and more...
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