Image resolution???

[defintelymaybe]

Images transferred from my Canon EOS 400D each appear to have a 72dpi resolution - is this normal?

 

[purpleclouds]

Don't worry about dpi...it is only used for printing purposes and is set in the editing software

 

[defintelymaybe]

So...

Does the camera store images at 72dpi? And what if i wanted them printing??

 

[GerryD]

check the image quality setting o n the camera could be set to lowest quality. Failing that check the download software to see if that is causing the problem.

 

[purpleclouds]

As I say, dpi only relates to printing, your camera captures pixels and thats that.

If you go into, for example, photoshop, and go and try and change the image size, you have the option of changing the dpi there....change it and see what happens to the related size in cm or inches

If you are printing through photoshop or windows printer wizard etc it tends to do it all automatically anyway!

Copied from wiki....

For example, a bitmap image may measure 1000×1000 pixels, a resolution of one megapixel. If it is labeled as 250 PPI, that is an instruction to the printer to print it at a size of 4×4 inches. Changing the PPI to 100 in an image editing program would tell the printer to print it at a size of 10×10 inches. However, changing the PPI value would not change the size of the image in pixels which would still be 1000×1000. An image may also be resampled to change the number of pixels and therefore the size or resolution of the image, but this is quite different from simply setting a new PPI for the file.

 

[Janice]

check the image quality setting o n the camera could be set to lowest quality. Failing that check the download software to see if that is causing the problem.

Its not a problem.... all cams do that. if you then make it 300 for printing... it will make it 4 times smaller then when it was 72dpi and its native size for printing... ie 12x8 or whatever.

 

[TrevDR]

By default, some cameras save digital images in arbitrary values as 72 dpi (or 180 dpi in some cases), this number is confusing in many ways. First, actually the correct term is ppi because a digital image has nothing to do with printing (or “dots”). The appearance of 72 ppi does not mean that your digital photo is
of low quality.

But the camera just assumes that you want to display that image on a computer monitor which traditionally has been 72 ppi (a 72 pixel by 72 pixel image should take up about one inch of space on the screen)

With new monitor models constantly released, of course they are packed with ever more pixels in each square inch so there are actually more than 5,184 pixels (72 pixels wide x by 72 pixels high) in every square inch but the camera manufacturers still follow convention of 72 ppi.

 

[defintelymaybe]

It's all so confusing.

I basically have a selection of images (each at '72dpi') that I'd like to upload to Flickr for public viewing; now for best results do I, A.Just reduce the scale, B. Increase the resolution and then reduce the scale??

ARRGGGHHHH!!! :bonk:

 

[apkent]

If you're putting them onto Flickr resize them to about 1000pixels and upload - forget the dpi, it really doesn't matter