Cropping Question

[rusty]

Just recently downloaded Picasa to experience editing software , I notice that posters on here state 30/40/100% etc crop after their pics.
Can someone explain to me in simple terms what this means or can point me to a thread that may help.
I understand that cropping can be helpful to produce the final pic I want to see and will reduce quality somewhat but thats all I understand.
On Picasa for instance it gives 3 option sizes + manual after selecting crop but little unsure what the sizes mean.

Basic question I know but stugglin to find answers for Picasa ( no manual ).

Thanks

Julian

 

[Kerioak]

When a picture is opened at full size it is 100% but you normally would not see the whole thing on screen unless you reduce the size.

If the picture straight from your camera is 2400 x 1600 pixels for instance and you cut it into quarters you would have four 600 x 400 pictures at 100%. If you reduced the size of the whole picture to 600 x 400 it would be 25%.

100% crops from pictures are generally used if the subject takes up a lot of the background and you just want to show part of it at full size - or as I did in Post 43 of this thread I cannot remember if this was actually 100% but it shows a proportion of the image and, inset, the full image it came from.

Cropping - removing or selecting part of the image
Resizing - making the whole image larger or smaller


Does this help or have I muddled you up completely?

 

[Cobra]

When a picture is opened at full size it is 100% but you normally would not see the whole thing on screen unless you reduce the size.

If the picture straight from your camera is 2400 x 1600 pixels for instance and you cut it into quarters you would have four 600 x 400 pictures at 100%. If you reduced the size of the whole picture to 600 x 400 it would be 25%.

100% crops from pictures are generally used if the subject takes up a lot of the background and you just want to show part of it at full size - or as I did in Post 43 of this thread I cannot remember if this was actually 100% but it shows a proportion of the image and, inset, the full image it came from.

Cropping - removing or selecting part of the image
Resizing - making the whole image larger or smaller


Does this help or have I muddled you up completely?

Only inasmuch if you have a 2400 x 1600 image
cut it in to 1/4 ie that is one cut vertically and one cut horizontally you are left with 4 @ 1200 x 800

 

[Kerioak]

I think I will avoid any posts that need even the simplest of maths in future

 

[rusty]

Thanks forn the explanation Kerioak .

 

[Cobra]

I think I will avoid any posts that need even the simplest of maths in future

Don't worry its usually me that does that sort of thing but I am glad to see that I am not the only one