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I'm trying to get information about scanned images that are saved into PDF files through iText (using Java).
I can get width and height (either through Matrix
, or through BufferedImage
).
The idea was to use the answer here to calculate the DPI, but I am a bit lost.
Are these values (width and height) in pixels or points? Is there any other way to achieve this?
There are a lot of answers on how to scale and save an image to a PDF file, but I didn't find any on how to read the width/height/scale
of an image and be confident about the result.
Posted on StackOverflow on Aug 28, 2014 by Finik
Let's split this problem into two separate problems. To calculate the DPI, you need two sets of values: a number of pixels and a distance in inch.
wPx
and wPx
.wInch
and hInch
.Now you can calculate the DPI in the x direction like this: wPx / wInch
and the DPI in the y direction like this: hPx / hInch
.