[Eaglerapids]

not needed

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Last edited by Eaglerapids; 12-31-2009 at 09:29 PM.

[stevebrot]

Steve you posted while I was preparing my post.
What puzzles me is that LR2 gives you a chance to crop to an aspect ratio but why doesn't it give you the option to crop to a specific size like 800X600 pixels?? Instead a guy has to fiddle with it to get somewhere close to a specific size. I don't understand the reasoning.

I agree...it is very cumbersome. It would be nice if the crop dimensions were displayed somewhere while you were doing the crop.

Steve

[dosdan]

You get an image file from a camera. Assuming you have not yet resized it, any crop you perform will be an "100% crop". You crop, and then save it without resizing. That's it.

If you've saved the crop as a PNG (Portable Networks Graphics) or TIFF file, it will be relatively large, but will be exactly the same as that portion in the original file (aside from colour-space considerations) as these are non-lossy formats.

If you save the crop as a JPEG it will be much smaller since it is lossy compression. This is much more suitable for the web, but it's no longer exactly the same as the original portion.

Note also that, if you shoot JPEG in the camera, same loss occurs. If you want to get the original, you have to go the RAW -> TIFF route.

You post your 100% crop in this forum. 100% crops are generally smaller than the screen - you want to draw attention to some specific part of image. If the forum member views the cropped image at 100% magnification, they should be close to what was in the original. (The colour gamut of the display will have reduced the accuracy of the colours though.)

If the receiver views the cropped image at 50% or 200% magnification instead, the graphics package's display resizing algorithm has altered the image.

Similarly if you resize the image before cropping, or after cropping but before saving, the graphics package's resizing algorithm has altered the image.

So the concept of the 100% crop is trying to show a small portion of the original image, as recorded by the camera, as accurately as possible.

Dan.

[dadipentak]

I've been confused by this too (and driven a couple of people nuts with my obtuseness) but I think your post helps, Dan. So I opened up a RAW, took a crop about 800pixels wide and saved it as a jpeg (see attached). That's it?

Attached Images

 

[stevebrot]

I've been confused by this too (and driven a couple of people nuts with my obtuseness) but I think your post helps, Dan. So I opened up a RAW, took a crop about 800pixels wide and saved it as a jpeg (see attached). That's it?

Except that what you posted is only 480 pixels wide. A 100% crop would be 800 wide.

Steve

[stevebrot]

You get an image file from a camera. Assuming you have not yet resized it, any crop you perform will be an "100% crop". You crop, and then save it without resizing. That's it...

What a great explanation! That is it exactly!

Steve

[dadipentak]

Except that what you posted is only 480 pixels wide. A 100% crop would be 800 wide. Steve

Yeah, so how did that happen--PF resized it?

[stevebrot]

Yeah, so how did that happen--PF resized it?

Quite likely.

Steve

[dosdan]

When you right-clicked on the cropped image on your PC, not in your browser after uploading, and look at it Properties. What is the height & width?

Here is a small, yet powerful freeware image viewer that shows the crop dimensions: FastStone Image Viewer, Screen Capture, Photo Resizer ...

1. Start FS.
2. Navigate to the directory where the RAW file is
3. Click on the image to select it.
4. Up the top, select Edit | Crop Board.
5. As you click-and-drag your mouse over the area to be cropped, the dimensions show at the bottom left:




6. Click on "Crop to File" and give it a name.
7. Go to the directory where you saved it and you'll immediately see its dimensions:




Here is the image uploaded to my personal webspace & linked via the IMG tag:



Right-click on the image in your browser and check its properties. It should be 417 x 357.

Dan.

[Canada_Rockies]

An example of a 100% crop would be the following image of just the mast that holds up my satellite dish so that the sight line clears the trees behind the house. The full image is also displayed for comparison. The crop is 249 x 372 pixels, the full image is of course 2592 x 3872, the K10D sensor.

Anyone interested in what the DA 12-24 does facing due South at 4 pm on November the 16th at 4 pm, 1/160 sec @ f/5.6, ISO 100, matrix metering pattern, no compensation, this is it. I did not crop for my sloppy horizon, sorry. I had had the lens and the k10d it is mounted on about 3 days at the time.

According to Google Earth, this building is at 49 degrees 44 minutes 42.17 seconds North latitude, 114 degrees, 53 minutes, 52.11 seconds West longitude, elevation 1162 metres (3,816 feet).

[dadipentak]

Actually, I did the crop in FS. Since I don't understand IMG tags either, I uploaded the crop to my album and inserted it from there. Bottom line: I understand what a 100% crop is and can upload one on PF. Thanks for all the help, Dan--I think I'll take a nap ;~)

[dosdan]

The crop that was resized in PF ended up as 600h x 480. Assuming it was originally 800px wide as you stated, that makes the original crop dimensions 1000h x 800w. Now there are four ways to show images on this site.

1. Attachment at end of msg. This is what you did as it said "Attached Images". Unfortunately the max. size is 900w x 600h. Since you attached an image that was higher than 600px, it resized it to 480w x 600h.

2. Embedded within msg from Album (max. 1024 x 1024) or Gallery (no limits - greater than 1000w, better to link thumbnail to album, rather than show album original - users don't like scrolling horizontally to read text in a forum message that is super-wide due to the presence of extra-wide embedded/linked images).

3a. Linked within msg, using the IMG tags in the Enhanced PF WYSIWYG editor, from your external web space.

3b. Linked within msg, using the IMGWIDE tags in the Enhanced PF WYSIWYG editor, from your external web space. Reduces width to 640x. Click on image to see larger version. Larger version is limited to max. viewable area in browser - no scrolling. Also display resizing method is quick, but low-quality, so diagonal lines can end up jagged.

Here is a test image of that size (1000h x 800w - it's only 16KB) to show when the file will be resized:


1. Attached at end. Because the max height is 600, the image is resized to 480w x 600h.


2. From Album.





3a. IMG tags. I cut & paste the URL to the cropped image situated on my personal web space & enclosed it within IMG tags in this forum message to get:

{IMG}http://users.on.net/~dosdan/Crop%20Example/test_image.jpg{/IMG}

except I actually used square brackets "[]", instead of "{}".





3b. IMGWIDE tags. No shown here. More suited to wide images than tall image.


Dan.

[dadipentak]

Thanks, Dan!

[stevebrot]

Dan,
Someone should make your comment a sticky!

Steve

[Peter Zack]

Thanks Dave, It's a sticky now.