Cropping AFFECTS your image quality !!!


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erictan8888

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Nov 9, 2004
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#1
hi,

just like to ask:

when you crop your pics in photoshop, does it matter if you open picture at 33% view size and crop

compared to if you open picture at 100% view size and crop ?

will there be any difference to the final image quality when using both ways?


thanks
 

idor

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Nov 11, 2004
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#2
erictan8888 said:
hi,

just like to ask:

when you crop your pics in photoshop, does it matter if you open picture at 33% view size and crop

compared to if you open picture at 100% view size and crop ?

will there be any difference to the final image quality when using both ways?


thanks
None that i know of....:think:
 

erictan8888

Senior Member
Nov 9, 2004
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#4
so when people ask for a 100% crop, they mean what?

is it view at 100% and crop? then should be different right? funny....
pls advise

thanks
 

raptor84

Senior Member
Dec 6, 2005
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#5
It would be more ACCURATE if you opened it at 100% and cropped as you would know exaclty what your final image would contain but you would not be able to see how it would change the overall compstion much.

If you view at 33% and crop you would be left with a much larger area of the original image (provided you croped out roughly the same 'square' in the editing window) you can crop at 33% then zoom in to 100% to see your '100% crop'

I am assuming that you are using the crop tool in PS and have not defined the DPI and size constraints as those will automtically RESIZE your pics after you crop....
 

catchlights

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Sep 27, 2004
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#6
erictan8888 said:
so when people ask for a 100% crop, they mean what?

is it view at 100% and crop? then should be different right? funny....
pls advise

thanks
I'm not sure, after crop away 100%, what is left behide? still have any part of the picture left?
 

shinken

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Jun 9, 2005
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#7
Depends on what size you're viewing and printing. If you're cropping to view. Cropping to 100won't degrade the IQ *much*. But beyond 100% you will start losing resolution. Same thing applies to printing. The difference is that if you crop beyond the optimal resolution for print, then the IQ will start to degrade.
 

catchlights

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#8
when someone do a cropping, he need to view the full view of the image, it may not necessary at 100% zoom, how big is the monitor? can it show a full view of large file image at 100% zoom?


I believe that the meaning of what people say "100% crop", is actually "100% no cropping".
 

espn

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Dec 20, 2002
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#9
raptor84 said:
It would be more ACCURATE if you opened it at 100% and cropped as you would know exaclty what your final image would contain but you would not be able to see how it would change the overall compstion much.

If you view at 33% and crop you would be left with a much larger area of the original image (provided you croped out roughly the same 'square' in the editing window) you can crop at 33% then zoom in to 100% to see your '100% crop'

I am assuming that you are using the crop tool in PS and have not defined the DPI and size constraints as those will automtically RESIZE your pics after you crop....
That's only the view, effectively based on what you mentioned, 33% crop and 100% crop is still the same angle of view. Therefore there are no differences between 33% and 100% if the crop is at the same area.
 

espn

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#10
catchlights said:
I believe that the meaning of what people say "100% crop", is actually "100% no cropping".
Yeah, :thumbsup: Good explanation.
 

evershine

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Dec 15, 2003
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#13
If your view size is at 33%, the photo quality may look good/better than when you view at 100%. This is epecially so if the object of focus in your photo occupies only a very small area of your entire photo. Or if when you shoot, it is slightly off focus. Or if your camera resolution is very low.

100% crop does not mean view at 100% then crop, it just mean that if you crop using 800x600 you are actually cutting out a very small portion of your image using 800x600. Your image maybe 3000x2000 but you are cutting a small portion of 800x600 of your photo. It is still consider 100% crop.

But after you crop using 800x600 and then you change the image size to 1600x1200 and save it, then it is not a 100%crop!

Viewing at 100% and crop using 800x600 or 1200x768 or etc, will give you exactly what you get --- or rather what you see is what you get.

Man...this is hard to explain...
 

catchlights

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#14
evershine said:
If your view size is at 33%, the photo quality may look good/better than when you view at 100%. This is epecially so if the object of focus in your photo occupies only a very small area of your entire photo. Or if when you shoot, it is slightly off focus. Or if your camera resolution is very low.

100% crop does not mean view at 100% then crop, it just mean that if you crop using 800x600 you are actually cutting out a very small portion of your image using 800x600. Your image maybe 3000x2000 but you are cutting a small portion of 800x600 of your photo. It is still consider 100% crop.

But after you crop using 800x600 and then you change the image size to 1600x1200 and save it, then it is not a 100%crop!

Viewing at 100% and crop using 800x600 or 1200x768 or etc, will give you exactly what you get --- or rather what you see is what you get.

Man...this is hard to explain...
That's should define as "cropped for view at 100%"
 

firestone

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Mar 2, 2003
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#15
LOL...recently I noticed when newbies ask a Qn, they very often becomes more blur...:bsmilie:

NO! will NOT in anyway affect quality.FULL-STOP

Never heard of eg,33% crop,50% crop..perhaps you can ask and enlighten us. Don't worry it's not a general term and it's not a stupid qn.:)

The only option which MAY Remotely resemble the above mentioned is if you select 'Hide'. Here what happens is that your image appears cropped but it is actually still there beyond the image window. Move the cropped layer around and you'll get what I mean...


Hope this helps..:D

Cropping WILL NOT affect image quality..
 

#16
If you're in photoshop and your view is at 33% that is what you view on the screen, which in the cases that have been explained here, a 33% is a wider view which can help you see the full big picture. The word here is VIEW. whatever percentage you view it, has no effect on the pixels of your photograph.

Cropping, however will bring down the IMAGE SIZE of your picture. You can continue to edit the image size (where necessary for printing or screen viewing) under IMAGE >> IMAGE SIZE.
 

pai

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Nov 24, 2004
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#18
erictan8888 said:
so when people ask for a 100% crop, they mean what?

is it view at 100% and crop? then should be different right? funny....
pls advise

thanks
ok, as you can see from your many replies, makes no diff if you crop when viewing at 100% or at 33%.

as for what a 100% crop is... most of the pictures you see on the forum have been resized because at 100% it would be bigger than the screen and hard to view. so people resize the picture from say 3000x2000 to 600x400.

but if you want to have a good look at how noisy a camera is, or how much chromatic aberration you get from a certain lens, or just to compare equipment side by side, it's much easier to see the details when the image is 100%

so to do this on the web, people post 100% crops: they crop out small sections of the picture, and DON'T resize it. e.g. crop out a 600 pixel x 400 pixel section of a 3000x2000 picture, and post it.
 

quantize

New Member
Sep 28, 2005
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#19
I think.....

say for a image size of 3000 times 2000 pixels,

if u wanna do a "100%" crop, means u remove a most of the pixels (cropping) leaving a small part of an image. Like if you take a photo of a bottle, maybe you are left with the cap. So probably the cap is only 400 by 300 pixels. So on a laptop screen tat is of 800 by 600 resolution, every pixel on the LCD screen shows a pixel on the cap. so probably it will occupy 50% of the height and 50% of the width of the screen. Thus every pixel of the photo is shown so that people can see each of the pixel of the photo clearly.


If you view 33% on photoshop, this means that every 3x3 pixels in the photo is represented by a pixel on the screen (1/3 of the height and 1/3 of the width). However internally in the computer, the pixels is still stored but just that it is not represented on screen.

If you resize this image 3000 by 2000 to 750 by 500, you are actually merging 4x4 pixels of data into one pixel of data by some algorithm. So picture data is actually lost. So a bottle represented in this picture is not "cropped" away rather the bottle is still a whole bottle but less details. So if you want to show "100% crop", do not resize the image, rather crop it.



Hope this makes sense somehow...
 

erictan8888

Senior Member
Nov 9, 2004
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#20
thanks for all the replies.... cleared up doubts liao...
thanks again.... :)
 

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