[digiKam-users] More on changing image resolution

[digikam at 911networks.com]

This is why there is imagemagick: https://www.imagemagick.org/

to resize: convert -size 1980x1020 infile.jpg outfile.jpg
to compress: convert -quality 65 infile.jpg outfile.jpg

and you can combine them...

http://www.imagemagick.org/Usage/resize

What I wish is somebody provides an "execute command" after
processing of the image.

I do this manually because the resize of DT is "mushy", so I export
full size and resize/shrink + sharpen in IM. (btw the parameter are
executed in the order of the command line)


On Sat, 24 Aug 2019 14:35:52 -0600
Northern Colorado Event Photograph <no.colo.event.photog at gmail.com>
wrote:

> Yes, I understand that ". . . a digital image doesn't have an
> intrinsic size in inches, only a size in pixels."
> 
> And I also understand that "Resolution plays a role when
> printing . . . ."
> 
> But that is my point.
> 
> Suppose you are processing (for example) a low res JPG image out of
> a smart phone,  And you have a request for a print (4 x 6 or 5 x 7).
> 
> To provide a satisfactory print, it may make sense to increase the
> resolution of this image.  Yes, I understand that this is not
> usually a good idea and can potentially result in a number of
> issues with the final product.
> 
> Nevertheless, it is worth a try, if for no other reason that to
> make the requestor (customer/client) happy.
> 
> Now 300 ppi doesn't make sense in this case, but 120 or 150 might.
> 
> Unfortunately, if I correctly understand the messages in this
> thread, there is no way in digiKam to make this change independent
> of changing the dimensions (resizing) of the image.
> 
> BTW, FWIW, here a number of links to articles that can help both
> amateurs and professionals obtain a better understanding of this
> topic:
> 
> Rediscover - Understanding Resolution - Luminous Landscape
> https://luminous-landscape.com/rediscover-understanding-resolution/
> 
> Res-Demyst - Luminous Landscape
> https://luminous-landscape.com/res-demyst/
> 
> The Truth About Resolution - CreativePro.com
> https://creativepro.com/the-truth-about-resolution/
> 
> Understanding Resolution - Luminous Landscape
> https://luminous-landscape.com/understanding-resolution/
> 
> ShortCourses-Pixels per Inch
> http://www.shortcourses.com/sensors/sensors1-15.html
> 
> Peachpit: Creating and Managing Images > Changing Image Size and
> Resolution
> http://www.peachpit.com/articles/article.aspx?p=705532&seqNum=3&rl=1


-- 
sknahT

vyS