https://bugs.kde.org/show_bug.cgi?id=466653
Bug ID: 466653
Summary: a5 300dpi resolution it not following iso standards
Classification: Applications
Product: krita
Version: 5.1.5
Platform: Ubuntu
OS: Linux
Status: REPORTED
Severity: minor
Priority: NOR
Component: General
Assignee: krita-bugs-n...@kde.org
Reporter: isabelle.ax...@gmail.com
Target Milestone: ---
The preset dimension for a5 300dpi is eh, kind of incorrect but maybe not, it's
a bit confusing.
Currently the dimensions are 1754 x 2480, but according to a bunch of website
and the ISO standard (with a few calculations) it should be 1748 x 2480. The
width is off by just a few pixels.
The width should be 1748 according to:
https://www.papersizes.org/a-sizes-in-pixels.htm
https://www.graphic-design-employment.com/a5-paper-dimensions.html
https://www.quill.com/content/index/paper-buying-guide/a5-paper-size-dimensions-usage/default.cshtml
It should be noted that adobe are rolling with the 1754:
https://www.adobe.com/uk/creativecloud/design/discover/a5-format.html
But I did some calculations myself:
According to the standard ISO_216 the size is rounded to millimeters. The
dimension in mm for a5 is 148 x 210.
We only care about the width in this case, so let's keep working with only
that: 148 mm
According to https://en.wikipedia.org/wiki/Inch the conversion number is
0.03937008
148 * 0.03937008 = 5.82677184 inches
Resolution is 300ppi
5.82677184 * 300 = 1748.031552 pixels
Rounding that gives 1748 pixels.
So 1748 x 2480 seems to be the ISO compliant dimensions for an a5 at 300ppi.
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