Help with dpi

[Nostromo]

Ok so to this may sound a bit thick, but i've need to set the dpi of some images to 1400 max long x 1050 max high for a pi comp at the local camera club. So far all i can find about doing this is all about printing, which seem to suggest 300dpi. What i really want to know is, what is the best way/programme to do this with.

 

[Alastair]

Ok so to this may sound a bit thick, but i've need to set the dpi of some images to 1400 max long x 1050 max high for a pi comp at the local camera club. So far all i can find about doing this is all about printing, which seem to suggest 300dpi. What i really want to know is, what is the best way/programme to do this with.

Unless your printing it the DPI doesn't matter. It's irrelevant to a digital file.

 

[Nostromo]

It's to do with the image projector.

 

[Alastair]

It's to do with the image projector.

Just size it within the pixel dimensions specified.. i.e. max x pixels tall and max y pixels wide.

DPI is not relevant.

 

[Nostromo]

Ok so i've read the rules on sending in files for projected images, and it says 1400 pixels max long x 1050 pixels high max, does this make more sense.

 

[sirch]

So that's not DPI its the image size in pixels, so as Alastair said export it from your photo software as that pixel size

 

[Alastair]

Ok so i've read the rules on sending in files for projected images, and it says 1400 pixels max long x 1050 pixels high max, does this make more sense.

Yes.

 

[StewartR]

Ok so i've read the rules on sending in files for projected images, and it says 1400 pixels max long x 1050 pixels high max, does this make more sense.

Note that 1400x1050 is not the same shape as the images which your DSLR produces. 1400x1050 is a ratio of 4:3, whereas your images are 3:2. So this means you have two obvious options:
1. Crop your image to a 4:3 ratio, and then resize to 1400x1050.
2. Leave your image uncropped and resize it to 1400x933.

Or of course you could crop to a different shape if you like, and then when you resize you just need to make sure that the dimensions fit. For example if you crop to a 16:9 (HDTV) ratio the pixel dimensions will have to be 1400x787, or if you crop of square then you will reduce to 1050x1050.

 

[Nostromo]

Thanks for the help and replies. I have now sorted it.
I used lightroom to set the parameters to the maximum values in export and its done the calculations for me.

 

[StewartR]

Excellent. Once you've got your head around what you need to do, tools like Lightroom generally make it quite easy to do.