tutorial on 100% cropping

Is there a tutorial here on this forum as to do this 100% crop? I have tryed to follow some directions on U tube and my pictures are still small?
Would some one be kind enough to email me step by step instructions or direct me to an easy tutorial.
thanks.... i hope this is in the right thread...

What software are you using, and what end result are you trying to accomplish?

I use photo shop CS5 extended.... when other photos show up on this form they are big.. mine are small ??

A 100% crop allows you to post a small section of a 100% view of an image. This is generally only useful for seeing fine detail or faults.....is this what you're trying to do?

After 100% cropping you need to look at the pixel dimensions, thats what affects the size of image here. Typically I tend to resize so that the longest dimension is around 800 to 900 pixels. Too many and the image is too big to see all of it on screen.

If you want a larger result, just don't crop so tightly. Extend the crop box out a little and you will have a bigger image. At the end of the day though, the size is unimportant, so long as you show the part of the original image that you need to post.

Lowner wrote in post #14831253
After 100% cropping you need to look at the pixel dimensions, thats what affects the size of image here. Typically I tend to resize so that the longest dimension is around 800 to 900 pixels. Too many and the image is too big to see all of it on screen.

But if you resize the image, it won't be a 100% crop anymore. The whole point of a 100% crop is to show (part of) the original image as one original image pixel per pixel on the screen.

jra wrote in post #14831218
A 100% crop allows you to post a small section of a 100% view of an image. This is generally only useful for seeing fine detail or faults.....is this what you're trying to do?

This is what a member told me before. He said view the photo at actual size (100%) then crop the area you want. The final image is then 100% crop. Am I being simplistic or is there more to it, technically speaking?

sandpiper wrote in post #14831274
But if you resize the image, it won't be a 100% crop anymore. The whole point of a 100% crop is to show (part of) the original image as one original image pixel per pixel on the screen.

While you are quite right, it depends on what you want to demonstrate. The reason most show 100% is to discuss things like noise, sharpening artifacts etc. These can be resized to a convenient size without causing any issues. Off the top of my head I am struggling to think of a scenario where it would matter although there are bound to be one or two.

The alternative is to be aware of the pixel dimensions as you crop, to achieve the same final size on screen.

Canajun wrote in post #14831330
This is what a member told me before. He said view the photo at actual size (100%) then crop the area you want. The final image is then 100% crop. Am I being simplistic or is there more to it, technically speaking?

Nope, that is it. You don't even have to view it at 100% as you can take a crop whilst viewing it at 25% and then so long as you don't resize it, you will still have a 100% crop when you post it online (or view that crop at 100%). Viewing at 100% just makes it easier to judge the final size of the crop when IT is shown at actual size.

All a 100% crop is, is a section cropped from the original image without any resizing being performed. Then, when posted on the web, it is shown exactly as it came from the camera, pixel for pixel.

Sorry Richard, you are wrong. A 100% crop is never cropped - no way, never.

There is no resizing that does not change an image and it always matters to somebody.

Canajun wrote in post #14831330
This is what a member told me before. He said view the photo at actual size (100%) then crop the area you want. The final image is then 100% crop. Am I being simplistic or is there more to it, technically speaking?

that is correct

tzalman wrote in post #14832056
Sorry Richard, you are wrong. A 100% crop is never cropped - no way, never.

There is no resizing that does not change an image and it always matters to somebody.

Elie,

Have I not told you before I'm no computer expert? But I can live with being wrong. You need to explain to me some time why its so critical, otherwise I'll never grasp it.

Cheers,

A "100% crop" is ueseful for showing images on the Web that demonstrate things like sharpness of your camera/lens kit, input sharpness, fine detail sharpness, and so on. It may not show the final "visual impact" of your image, but may indeed show "factors" of your image that may indeed the final outcome of your image, especially if you plan to print your image to a size larger than say a small like 4x6 or 5x7 size.

To get a "100% crop" is fairly simple -- enlarge your image so that it fills the screen then crop part of the image so that it fills less than the screen. For POTN purposes it needs to be 1024 pixels at the widest dimension. That way when it is viewed on the Web it will be a "reasonable" viewing size.

Thanks Tony, but why is it so crucial that its exactly 100%? Thats what Elie pulled me up for suggesting. It seems to me for the purposes you have listed, there or thereabouts is quite good enough.

For example to show odd noise effects, or maybe sharpness which you list, why does it matter that its 100% and not, say 95 or 105%?