LIGHTROOM - real time pixel information during the cropping operation, both pixel count and cropping dimensions in pixels.

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I am submitting a number of photos to stock photo agencies. They require either a minimum number of pixels on the X and Y axis, or a minimum number of total pixels for the image. I issue I have is that I often crop an image and there is no real time feedback in the cropping tool to give me those two pieces of information. You can use the "I" button to get the crop pixel dimensions (assuming your View info is set correctly). The dimension does not change in real time, I have to cycle through the "I" info displays and when it comes around to displaying the dimensions it refreshes the info to the new data. This is still cumbersome. Ideally, the number of pixels in the cropped area and the crop dimensions (selectable as pixels or inches or mm or?) would be displayed in the crop tool space. Thanks for your consideration.
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Donald Trimble

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Posted 3 years ago

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Chris Cox

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Photoshop has this in the info palette.

So which application are you requesting this for?
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Donald Trimble

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Lightroom. I asked the question on the Lightroom help forum and was directed here to put in the request. If this is the wrong place let me know and I will go to the proper place.

Thanks for your reply.
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Donald Trimble

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In Lightroom the "I" button can be set up to display the X and Y axis pixel count. I can display the Megapixel count as well but that number does not change when cropping occurs. That seems to be tied to the initial sensor size. Ideally, the Megapixel count would change when cropping occurs. Certain stock photo firms require a minimum of 3 mega pixels. I would have to multiply the X and Y axis numbers together constantly to make sure the minimum is met as I am cropping. Just a pain.
thanks
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Steve Sprengel, Champion

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You can easily make a small cheat-sheet chart of what 3MP is for each of the common crop ratios where the most oblong one, usually 2:3 or 16:9, is the most limiting.

Just find an image, crop to the few common ratios and export using the LR 3MP Resize option, check the file properties and see what the longest side is, add it to the cheat sheet.

Here are a couple image sizes determined by exporting from LR using Export Resize 3.0 MP option:

16:9 = 2309 x 1299
2:3 = 2121 x 1414

One issue with using LR is that 3MP is technically 3 x 1024 x 1024 = 3,145,728, but LR approximates it as 3 x 1000 x 1000 = 3,000,000 so slightly smaller which is fine if you're limiting for maximum MP, but not minimum MP as you need Depending on your stock vendor, if you use LR's 3MP value, it could be slightly too small, and any reading on the "I" loupe information could be wrong and so part of your request needs to be that LR use the actual value for mega-pixels not the 3-million approximation.

The conversion of LR's small 3MP to the actual value can be done by multiplying LR's value by 1.024 x 1.024 = 1.048576 or approximately by 1.05, so the above cheat-sheet values become:

16:9 = 2309 x 1299 (x 1.05) = 2424 x 1364
2:3 = 2121 x 1414 (x 1.05) = 2227 x 1485

For an easy rule-of-thumb, make sure your longest side is longer than 2424 and you'll be fine as long as you're cropping to 16:9 or more square.
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You can also just ignore of most all of these details except making sure your longest side is maybe 2000 or greater and Export with Resize set to 3.2 Megapixels and make sure Don't Enlarge is UNCHECKED so upsizing would be allowed.

Personally I don't think I'd want to buy a stock image that was cropped to anywhere near 3MP at native resolution, because it'd likely be a bit soft or grainy, so upsizing slightly wouldn't make it any much worse.
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Donald Trimble

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Thank you for your reply. I had independently come up with a similar idea. My target is 3,000,000 pixels, which is the minimum allowed. If you take the square root of 3,000,000 you get the number 1732 ( 1732 X 1732 = 3,000,000). So, as long as both the X an Y dimensions are equal to or greater than 1732 I am fine. I only need to calculate the number of pixels if one of the dimensions drops below 1732 (It happens but not that often since the stock photo folks actually encourage you to send the biggest photo possible; I only crop for artistic reasons).
Again, your insight is much appreciated. It would still be nice if the tool(s) would multiply two number in real time and display them, but, I guess you can't have everything.
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John R. Ellis, Champion

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I just released the Any Crop plugin, which provides real-time display of the crop dimensions in pixels, inches, or centimeters, as well as the total number of pixels (megapixels).  Any Crop also provides a number of other crop enhancements users have asked for.