Maintaining 300dpi images

dan_m2k

Joined: 2006-04-19
Posts: 8
Posted: Fri, 2014-01-17 13:30

Hi all,

Hope you're all well?

I'm wanting to use G3 to manage our significant image repository. Amongst the image library are a bunch of print-res images at 300DPI.

I notice uploading them to G3 turns them into 72 DPI webres images. I really need to maintain them at their original DPI as we will be downloading them sometimes to print.

Also, is there a way of displaying the DPI or even by searching by it? For example, if I wanted to search for just 'print resolution' images, that would be amazing!

Thank you all in advance.
Dan.
 
floridave
floridave's picture

Joined: 2003-12-22
Posts: 27300
Posted: Fri, 2014-01-17 14:35

The original full sized image is not altered.
Does the EXIF date from the image offer the resolution?

Dave
_____________________________________________
Blog & G2 || floridave - Gallery Team
 
dan_m2k

Joined: 2006-04-19
Posts: 8
Posted: Fri, 2014-01-17 14:43

Sure, it shows as 300dpi in Preview on my Mac. After redownloading the original, it shows as 72dpi.

 
floridave
floridave's picture

Joined: 2003-12-22
Posts: 27300
Posted: Fri, 2014-01-17 16:45

please post the original 300dpi image here for testing

Dave
_____________________________________________
Blog & G2 || floridave - Gallery Team
 
dan_m2k

Joined: 2006-04-19
Posts: 8
Posted: Sun, 2014-01-19 09:13

I have made some progress with this: installing ImageMagick and enabling this in Gallery3 has resolved the issue in images becoming downsampled on upload to gallery.

Thank you for your help floridave.

On to the second part of my question, is there any way at all (perhaps through an extension?) to identify images that have a high DPI, if I could search for them that would be awesome, but tagging or something would work too.

The outcome being that I can search just for images that are high res, for example.
 
dan_m2k

Joined: 2006-04-19
Posts: 8
Posted: Sun, 2014-01-19 09:31

I have made some progress with this: installing ImageMagick and enabling this in Gallery3 has resolved the issue in images becoming downsampled on upload to gallery.

Thank you for your help floridave.

On to the second part of my question, is there any way at all (perhaps through an extension?) to identify images that have a high DPI, if I could search for them that would be awesome, but tagging or something would work too.

The outcome being that I can search just for images that are high res, for example.
 
floridave
floridave's picture

Joined: 2003-12-22
Posts: 27300
Posted: Sun, 2014-01-19 15:55

Glad you got it sorted, Still don't know why IM would if the alter the original.
I don't know of a module that looks for the resolution.

Dave
_____________________________________________
Blog & G2 || floridave - Gallery Team
 
tempg

Joined: 2005-12-17
Posts: 1857
Posted: Sat, 2014-02-15 04:38
dan_m2k wrote:
search just for images that are high res

You could modify the search module to only return results that are above a given resolution on one or both dimensions.
The width and height of the original image is stored in the db.

To get this working would take a bit of work, though, because you may have to have an option to toggle the "high res" option on/off and you'd have to deal with items that don't have a width/height (e.g. albums, etc).