Manual Corel AfterShot Pro 2 (page 19 of 100) (English)

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 File Size — typically measured in megabytes (MB), this measures to the amount of disk or memory card space

consumed by the image file.

 Pixel Size — measured in pixels or megapixels, this is measures the number of individual pixels or colored dots that

comprise the image.

 Print Size — measured inches, millimeters, or other physical units of measure. Any time a measure of length, like

inches or centimeters, is used to describe a digital image, they are referring to Print Size.

Every digital photograph from a given camera will start out with the exact same Pixel Size, which will be something like

6000x4000 pixels, or about 24 megapixels and corresponds to the number of photo sites or pixels your camera's sensor

has. However, the File Size for different photos from the same camera will vary. This is based on image content and is due

to compression techniques used to make the file as small as possible. Generally speaking, a higher megapixel camera will

produce larger files.

Print size is determined by two things: Pixel Size and how many pixels to print in a given physical size, commonly called

DPI or dots per inch or PPI, pixels per inch. For example, the 6000x4000 pixel image from the example above, when

printed at 300 DPI will be approximately 20 inches by 13.3 inches (6000 pixels / 300 pixels per inch = 20 inches).

Changing only the DPI in no way affects the file size on the photo or the pixel size, it only changes the Print Size. For

example, changing that same image to 600 DPI, which would yield a 10 inch by 6.6 inch print.

DPI and Print Size only matter when printing an photo; DPI is irrelevant to images on screen, in email, or otherwise

viewed, edited or used on a computer. Pixel Size alone determines how much information or "quality" in stored in the

image file.

Cropping and resizing

Cropping an image is used to recompose the shot to include only portions of the original image, or to change the Aspect

Ratio — the height relative to the width — of the photo. If you have several images from the same camera that you want

to print the same size, some after cropping and some without cropping, then the DPI of those images must be different.

Resizing allows you to make the Pixel Size larger or smaller than the original image. To continue the example from above,

suppose you cropped a portion of the image from the center of the frame, say 1500 by 1200 pixels. A "Full Size" output

image from this cropped image would be 1500 by 1200 pixels — much smaller than your original image. You could print

this image at 10 inches by 8 inches — but that would be at 150 DPI (passable, but lower print quality). If you wanted to

make an image in Corel AfterShot Pro that had the same pixel dimensions as the original file, you would need to upscale

— or stretch the image. Upscaling does not add information or quality to the photo, it is not generally recommended

because it will not print significantly better results than before the image was upscaled.

Note: For more information about cropping, see

Cropping

When DPI or Print Size matters

If you print from within Corel AfterShot Pro, then DPI and Print Size will be handled for you automatically by our Print

Output system. If your images are only shown on computer screens, in email or in other electronic forms, then DPI and

Print Size are meaningless.

DPI and Print Size only matter when you output images from Corel AfterShot Pro to be printed by someone else.

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Corel AfterShot Pro 2 Manual

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