Tell me something about.........

[dicklaxt]

crop percentage.

I know how to and what cropping is but if some one asked me how much I cropped an image,all I could say was a little bit ,or a lot, etc.

I keep hearing and/or reading where someone would say its a 50% crop or its 100% whats the relationship to the original image. Heres an example lets say I took a pic of a bird in flight whether it was close or far does'nt matter.I now crop this image and bring in the crop framing lines so that it has as much of the image within the lines as I can get.Whats this called in terms of %? Now if I only brought the lines in to encompass an area that would fit on a 4 x 6 piece of photo paper whats this called in terms of %?

dick

[brianch]

When people here give 100% crops they are giving you a cropped images of the photo at 100% view. That means that the view is at the 100% pixel level. Users do this to show an images noise levels or sharpness. There is another way to put cropping into a percentage and that is when say you have a photo of a duck and the duck is only filling up 10% of the frame because at the time you were using a wide angle lens and couldn't fill up the frame completely with the duck. You would crop the duck out and say that the final image is around 10% cropped from the original image.

[dicklaxt]

Now that really confused me care to elaborate on all that.

dick

[number six]

Now that really confused me care to elaborate on all that.

dick

When someone says "100% crop" they're really saying two things:

- this image is cropped from the original image
- it's 100% of its full size - it hasn't been resized.

Make sense?

-js

[dicklaxt]

Where did it move too???

[ToddR]

Think of a 100% crop as a small excerpt of a huge image file at its original resolution. The full image would be much wider and taller than your monitor, but with a cropped portion of that at 100%, one can evaluate many properties of the original without the bulk of the original.

[tonylong]

Terminology can get confusing, and you've nailed one of the culprits!

In addition to what others have said, just a simple explanation: the concept and term of a "100% crop" only applies to displaying/viewing a digital image on a monitor. It is derived from the fact that our monitors have a given resolution of pixles per inch, and when we view an image at "100%" that means the application you are using maps one image pixel to one monitor pixel. That way, when you view the image, you get precise detail on a pixel-to-pixel basis for some tasks, such as evaluating lens sharpness or focus or image noise and adjusting sharpness and noise reduction.

When someone refers to showing a 100$ crop this means cropping a portion of the image to display that can fit within a typical monitor when "expanded" to a 100% view. Most images displayed on the Web are dramatically shrunken and so are useless if you are looking for critical sharpness or noise that will show up in a large print. So, it can be useful when discussing such issues with people on a forum like this to post an example, a "100% crop" so that everyone will see the same detail as you do when you view an image on your monitor.

For cropping an image to get better composition, thinking along a "percentage" doesn't mean much. The closer you crop, though, the more important things like critical sharpness and noise control will matter.

[dicklaxt]

Thanks Tony thats bringing it together.

dick

[asysin2leads]

If I ask you if a specific image is sharp and I present this.......

http://img32.imageshack.us/img32/5060/img40662.jpg

It may not be able to tell just how sharp the pic is. Then I post a 100% of the original and it's easier to see the edges and fine detail. Here is a 100% crop of the above image.

http://img196.imageshack.us/img196/2822/img40662100.jpg

Does that help to clarify?

[tonylong]

It sure pleases us rivet counters:)!