Is this what is meant by a 100% crop?

footman

footman

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Laurence
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I'm struggling to understand this subject so I'd like some help please. After many hours googling and reading I've finally come up with this, so please tell me if I've grasped it!

I'm using Lightroom 3. If when I'm in the develop module I click "I" and see that an image is 3888 X 2592. So I crop it to the bit I want to see and export it.

In the export 1 file dialogue box I move to "image sizing". I select "resize to fit" and enter the above measurements. I then export it as a jpeg.

When I examine the exported jpeg I see the dimensions are 3483 X 2592, so it's not quite exact.

Have I now got a 100% crop?
 
Most people's monitors are 1024 x 768 or greater so you need to keep the image size smaller than this in order for anyone to see the whole image on their screen at 1:1 (pixel to pixel).

So in Lr3, view the image at 1:1 (100%) and what you can crop and export on screen will be a 100% crop. Don't resize further. In the export dialogue don't select to limit pixel size - export the whole crop.

As I say abopve a 100% crop allows you to view the image at 1 pixel on your image to 1 pixel on your screen.
 
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Be aware that some image hosting sites (e.g. flickr) can and do resize images to fit their idea of what is right. Sometimes you need to crop smaller than their sizes to get it to display correctly. Does depend on the image hosting tho...
 
arad85 said:
Be aware that some image hosting sites (e.g. flickr) can and do resize images to fit their idea of what is right. Sometimes you need to crop smaller than their sizes to get it to display correctly. Does depend on the image hosting tho...
Click to expand...

Yes the hosting companies may add compression to your images although they don't change the pixel dimensions.

The crops remain the same and small crops should generally be ok.
 
EOS_JD said:
Yes the hosting companies may add compression to your images although they don't change the pixel dimensions.
Click to expand...
Flickr does if you aren't a fully paid up member and you don't select the right size. You also need to be aware of which image you actually select (I think the default is 640). If your crop is larger than that, the default that is shown will be resized....
 
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To do a 100% crop, you don't need to know what resolution monitor everyone else is using, and to post a 100% crop up, you just need to keep the size of the crop within the limits of whichever site you are posting to.

To the OP, what you suggest you are doing doesn't sound right, as displaying a 100% crop shouldn't involve any re-sampling.

To create a 100% crop, all you need do is select a part of your picture when it is being displayed at 100%. That's it.

Why do we do that? As you already know, when viewing a picture at 100%, it doesn't all fit on your screen, which means yo have to scroll around to view it. However, viewing a picture at 100% can sometimes allow us to determine whether an image is really sharp etc.

The other problem is that a full sized image exceeds the limits imposed by most sites, so if we want to share our image with others to perhaps obtain their opinion about some aspect of the image, we can't post the entire image because it is too big.

So what do we do? We make a 100% crop. To do that, all you need to do is magnify your image in whichever editing software you use, until the image is displaying at 100% i.e. full size. You then take your crop tool, and crop a piece of the image, making sure that the size of the piece you are cropping meets forum posting limitations.

Save the crop separately from your actual image, and post it up. That's it.
 
Scarecrow said:
To do a 100% crop, you don't need to know what resolution monitor everyone else is using, and to post a 100% crop up, you just need to keep the size of the crop within the limits of whichever site you are posting to.

To the OP, what you suggest you are doing doesn't sound right, as displaying a 100% crop shouldn't involve any re-sampling.

To create a 100% crop, all you need do is select a part of your picture when it is being displayed at 100%. That's it.

Why do we do that? As you already know, when viewing a picture at 100%, it doesn't all fit on your screen, which means yo have to scroll around to view it. However, viewing a picture at 100% can sometimes allow us to determine whether an image is really sharp etc.

The other problem is that a full sized image exceeds the limits imposed by most sites, so if we want to share our image with others to perhaps obtain their opinion about some aspect of the image, we can't post the entire image because it is too big.

So what do we do? We make a 100% crop. To do that, all you need to do is magnify your image in whichever editing software you use, until the image is displaying at 100% i.e. full size. You then take your crop tool, and crop a piece of the image, making sure that the size of the piece you are cropping meets forum posting limitations.

Save the crop separately from your actual image, and post it up. That's it.
Click to expand...


Scarecrow you are right. Monitor res does not matter. But generally most keep it withoin the size of the average screen res.

Like you say zoom to 100% and crop what you will (without any resampling). I forgot to mention that very important part :)
 
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