JPG help needed

[anthrax]

I have some pics with a resolution of 100X100 dpi

Does that mean it is 10000 dpi??? or just 100 dpi?

 

[anthrax]

^^^

 

[blut wump]

dpi can be expressed in horizontal and vertical resolutions. Given that they're the same then it's really just 100 dpi. The clincher is whether the pictures are utterly huge or normal-sized. Standard printer resolution is 300 dpi. A fine pc printer might go up to 2400 dpi. A typical laser printer is 600 dpi. Just for some guidelines.

 

[Mr. dB]

dpi = dots per inch

A picture is a two-dimensional display, so to specify its resolution, you need a two-dimensional specification. 100x100 means one hundred dots per inch in the vertical dimension, and one hundred in the horizontal dimension.

 

[anthrax]

dpi can be expressed in horizontal and vertical resolutions. Given that they're the same then it's really just 100 dpi. The clincher is whether the pictures are utterly huge or normal-sized.

Thx buddy!

On a side note the same pic is 100 dpi according to my Photoshop-like software and 300 dpi according to Microsoft Paint

 

[digger]

"Dots per inch" is a linear measurement, so you have a 100dpi pic.

In theory if it were one inch by one inch, that would be 100 x 100 or 10,000 dots, times the color depth (e.g. up to 32 bits per dot) or 320,000 bits total, or about 32KB. The .jpg format uses compression so it could end up as small as 7KB, depending on how complex the content is.

 

[blut wump]

It'll be trying to be helpful in nice MS fashion and assuming you want to dump it to an inkjet at 300. I think Photoshop usually defaults to 72 dpi when it pulls in a jpg which doesn't have its dpi specified. I know which I'd trust

 

[anthrax]

Thanks guys!

 

[blut wump]

One other consideration if you are planning to resize for printing is that an A4 will run to about 2400x3200 at 300 dpi.