what happens when resizing ?

Hi !

I use a 6.3mp camera, and shoots in raw. I develop the raw files in capture
one, and use tif as output file type. when making the tif-file, the program
is set to use 300dpi, and the size of the picture is 6,84 by 10,25 inch.

So, what happens when I print the picture in A3 or A3+, and resize it to fit
the paper ? Would it be better to make the tif-file in 200dpi (to get a bigger
picture) ?

Svein Olav

 

Your camera captures a total of 6.3 MP
The fact that the program saves images at 6.84 x 10.25" at 300 pixels/inch is just
a bookkeeping procedure. Ignore it.
Your program will let you resize the image to any size you choose, at a
correspondingly lower resolution (pixels/inch).
For instance, if you wanted to print a picture at say, A3 (11.7 x 16.6"), without
RESAMPLING, you would notice that the resolution automatically changes to: 175
ppi. (11.7 x 175) X (16.6 x 175) = 6.3 MP
175 ppi will produce a pretty nice print. But if you so desire, you can have your
photo editor "invent" some more pixels and insert them in the proper place and
your print may LOOK a little smoother. To do this tell your editor to Resample the
image to 11.7 x 16.6" at say 240ppi and you will see the new image has 2808 x 3984
= 9.6 MP.
Where did the extra 3.3 MP come from?..... Out of thin air.
Your Editor invented them according to its own resampling algorithm. Which, BTW,
is usually pretty intelligent.
Bob Williams