How can I search photos in my library by definition (300dpi or 72dpi) ?

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Hi, I have several questions before buy Lightroom licence but I haven't find how to do with trial version.
1° How can I search photos in my library by definition (300 dpi or 72 dpi) ?
2° Is it possible to search photos by same chromatic scale (all photos with most green for example, to match with a green page setting)
3° Is it possible to find doubloons (exactly same photo but not same title or format) ?
(I'm french, so please try to make simple answer)
Thank you for your answer.
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1) This question is based on a misunderstanding of resolution. A digital photo does not have resolution, i.e. it is neither 300 ppi nor 72 ppi not anything else ppi. A digital image has only a pixel dimension - so many pixels horizontal, so many vertical. That's all. Resolution comes only into play when we print an image. For a quality print we need a certain minimum amount of dots per inch. But as long as the image is digital (in the camera or on the computer) it has only pixel dimension - for instance 2000 x 3000 pixels. Therefore you cannot search by 300 ppi or 72 ppi.
2) What do you mean by "chromatic scale"?  And what do you mean by "photos with most green"?
Do you mean search for a photo that is taken - let's say - in a forest vs. a photo taken in the desert? No, you can't search for that in Lr since Lr does not recognize image content.
But if you mean by "mostly green" a color label - yes you can search for photos that have a green color label (or a red one, or yellow, etc.)
3) No. As already mentioned, Lr does not recognize image content. An exact duplicate of an image that has a different file name is a different image for Lr.

November 30, -0001

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