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PNG Save Resolution

Aug 19, 2011, 16:26
Post: #1
Question PNG Save Resolution
When saving as a .png file, there is an option to enable/disable "save resolution". What is this option for? I've tried Googling, but no luck due to many unrelated search results. I'm not Google wizz.

Hopefully this isn't too obvious an answer so I don't look too stoopid. Confused
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Aug 19, 2011, 17:36
Post: #2
RE: PNG Save Resolution
Well, it saves the... resolution (which is the indicative DPI/PPI value you set when creating the image (and that you can change with "Image/Print size").

But there are no stupid questions... (just stupid answers, sometimes Smile )

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Aug 20, 2011, 16:40
Post: #3
RE: PNG Save Resolution
I'm afraid I still don't understand. What is the ACTUAL difference if I select/not select this option? Surely the resolution is already set when I save the image, regardless of whether that option is selected, as the resolution is proportional to the image size? Or am I just wrong in what resolution means?

Thanks in advance, Ofnuts. ;D
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Aug 20, 2011, 16:58
Post: #4
RE: PNG Save Resolution
(Aug 20, 2011 16:40)LordDarkPhantom Wrote:  Or am I just wrong in what resolution means?
Guess Smile Don't confuse the size in pixels with the resolution. A 1000pix image printed on one inch is very high resolution (1000PPI), but billboard size (240") that"s fairly low-res (4PPI).

In Gimp, the only important things is the size in pixels. You can however also specify a resolution, or an intended display/print size (these two are equivalent once the size in pixels is fixed). This value is used when you print (as a default value, it can be changed) and at several places in Gimp itself (you can measure or position things in inches or mm instead of pixels). This is the value that can be saved in a PNG.

For the record, I have a house plan defined with a resolution of 92pixels/meter. This doesn't mean I want to print it on 15x10m sheet, it's just that I can use the measure tool on it and get sizes in meters directly, and I can also easily create a layer of .6x1.2m and move it around to see where that cupboard fits.

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Aug 21, 2011, 15:30
Post: #5
RE: PNG Save Resolution
Love ya man, that example helped me understand. Big Grin
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