how can i convert Pixel to mm^2 ?

[nemidoonam]

Hi guys, i calculated the area of something and i did it with photoshp. and it said for example it´s 600 pixel! what that means? where it#s the surface area how can i convert it to mm? the resolution was 300 dpi in horizonta land vertical.

thank you very much people, i really need to know how can i convert it to square millimeter

[LV_Pro]

I'm not sure what you are trying to do. Are you trying to use LabVIEW to do this? When you say photoshp, do you mean "Photoshop"? and when you say "it's 600 pixel" , do you mean in each dimension H&V? There are numerous reference when you "google" dpi conversion" here is one.

[nemidoonam]

hey, yeah by that wrong spelling i meant "Adobe photoshop" and no, i´m not trying to do that with LabView.i searched for this question and got here by a question like mine.so i thought maybe some one can help me. 

but my problem is that i want to convert to mm^2. i want to have an area converted from pixel to mm^2 ! the whole area was 600 pixel. there was no H/V ! it was the whole thing.

I actually try to calculate the grain size distribution. took their picture with microscope, and open the picture with adobe photoshop and it said the whole area is 600 pixel. and now i´m just trying to convert it to mm^2!

[GerdW]

Hi nemidooma,

why do you create duplicate posts for exactly the same question - that has been answered before in detailed manner...

Go back to your original post here!

To summarize:

Put a scale on your pictures, count the pixels needed for a length of 1mm, then multiply your number of pixels with (1/pixels per mm)^2. As easy as it is (if you don't care for high precision, as it seems) and all said before in that other thread...

Message Edited by GerdW on 12-21-2009 04:52 PM