On Wed, 14 Jan 2015, newbie wrote:
Flash Thunder, I think I went ahead
of myself in the email below. The upscaled image has the
same dpi as the original image( 96dpi). I ahve upscaled
pixels for which the ocr works without doing step 2 and
3(by trail and error). But I dont ahve a generic formula
to upscale all my images and hence struggling.
1. Do you know what the text size (pt) should be for 96dpi
?
2. Do you know if there are packages available to upscale
the resolution also ? Say from 96 dpi to 300 dpi ? is this
doable ?
The dpi isn't the most important thing. What is most
important is the size of the characters in pixels. As
Allistair explained, the lowercase characters like 'x'
should be at least 20 pixels tall to get good results.
It's okay if they are taller than that. It is not okay
if they get much shorter. So, just upscale all your
images so that the 'x' characters are at least
20 pixels tall. It's that simple.
dpi by itself is useless unless you know the font size,
as well. It is (dpi x font size) that is the important
quantity.
Cheers,
Rob Komar
