How to view resolution (ppi/dpi) and bit depth of an image

Hello,
how can I check the native resolution (ppi/dpi) and bit depth of my image files (jpeg, dng and pef)?
If it is not possible in lighroom, is there a free app for Mac that makes this possible?
Thank you in advance!

I have used several different cameras, which probably have different native bit depths. I assume that Lr converts all RAW files to 16 bits, but the original/native bit depth still affects the quality, right? Therefore, it would be nice to be able to check the native bit depth of an image and e.g. compare it to an image with a different native bit depth.....
I know a little bit of detective work would solve the issue, but it
would be more convenient to be able to view native bit depth in
Lightroom, especially when dealing with multiple cameras, some of which
might have the option to use different bit depths, which would make the
matter significantly harder.
This
issue is certainly not critical and doesn't fit into my actual
workflow. As I stated in a previous post, I am simply curious and wan't
to learn, and I believe that being able to compare images with different
bit depths conveniently would be beneficial to my learning process.
Anyway,
I was simply checking if somebody happened to know a way to view bit
depth in Lr4, but I take it that it is not possible, and I can certainly
live with that.
Check the specifications of your camera to know at what bit depth it writes Raw files. If you have a camera in which the Raw bit depth can be changed the setting will probably be recorded in a section of the metadata called the Maker Notes (I don't believe the EXIF standard includes a field for this information). At any rate, LR displays only a small percentage of the EXIF data (only the most relevant fields) and none of the Maker Notes. To see a fuller elucidation of the metadata you will need a comprehensive EXIF reader like ExifTool.
However, the choices nowadays are usually 12 bit or 14 bit. I can assure you that you cannot visually see any difference between them, because both depths provide a multiplicity of possible tonal levels that is far beyond the limits of human vision - 4,096 levels for 12 bit and 16,384 for 14 bit. Even an 8 bit image with its (seemingly) paltry 256 possible levels is beyond the roughly 200 levels the eye can perceive. And as has been said, LR's internal calculations are done to 16 bit precision no matter what the input depth (although your monitor is probably not displaying the previews at more than 8 bit depth) and at export the RGB image can be written to a tiff or psd in 16 bit notation. The greater depth of 14 bit Raws can possibly (although not necessarily) act as a vehicle for greater DR which might be discerned as less noise in the darkest shadows, but this is not guaranteed and applies to only a few cameras.

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How can I view resolution in DPI and not PPI?

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shlomit

Shlomit,
Strictly speaking, images do not have dpi (ever), only ppi. Images are made of pixels, not dots.
Dpi refers to prints.
However, in everyday use, the terms are loosely used interchangeably. They work out to exactly the same thing (same numbers), but ppi is the correct terminlogy.
See: http://www.scantips.com/basics01.html
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Printer ink dots and image pixels are very different concepts, but both use the term dpi in their own way (dots per inch).
Inkjet printer dpi ratings refer to printer ink dots (the four colors of ink), which is NOT AT ALL the same thing as image pixels. These are such different concepts that some people think we should reserve the term dpi for those inkjet ink dots, and reserve use of ppi only for image pixels. Not a bad plan, except that this view fails to recognize real world usage.
We may hear scanning resolution called spi (Samples Per Inch), and that is indeed what it is. We often hear image resolution called ppi (Pixels Per Inch), and that is indeed what it is. The spi and ppi terms are correct. But historical and common usage has always said dpi for image resolution, meaning pixels per inch, and fully interchangeable with ppi. Pixels are conceptually a kind of colored dot too, and resolution has always been called dpi, for years before we had inkjet printers. Dpi is just jargon perhaps, but it is a fact of life. Scanners and scanner ratings say dpi too, meaning pixels per inch (see dialog pictures here, here, here, and here). I habitually always say dpi myself, but I did try to switch to ppi in the book version.
We may use the term of our own preference, but we need to understand it both ways. Some photo editor programs have switched to saying ppi now, which has much to be said for it. But others have not switched, so insisting on conformity for others to only say ppi will necessarily encounter much frustration, because the real world simply isn't that way, and obviously is not ready to switch yet.
My point here is that we must understand it both ways, because we will see it both ways, often, in the real world.
It's easy, not a problem - the idea of printing digital images is always about pixels per inch, so when the context pertains to images instead of printers, all of these terms, spi, ppi, and dpi, are exactly the same equivalent concept - they all mean pixels per inch.
There is no problem understanding any use of dpi if you know the context. It always means the only thing it can possibly mean. If the context pertains to images or printing pixels, dpi means "pixels per inch". If the context pertains to inkjet printer ratings, dpi means "ink dots per inch". There is no other meaning possible. This should be clear and no big deal - the English language is full of multiple context definitions.

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Actually legacy issues are rampant. Even now, color management is very spotty, even in shops oriented towards professionals. Also, arguably the largest destination for digital file output, the web, is almost not color managed. sRGB remains king unfortunately. It could be so much better if everybody used Safari or Firefox, but that clearly is not the case yet.
- And standardize 16 bit formats on the widest gamut supported by whatever you're doing with it? - ProPhoto for editing, and maybe whatever gamut is recommended by other software or hardware vendors for special purposes...
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Personally, all my web photos are presented through Flash, which supports AdobeRGB even if the browser proper does not. So I don't have legacy browsers to worry about myself.
Flash only supports non-sRGB images if you have enabled it yourself. NONE of the included flash templates in Lightroom for example enable it.
that IE was the last browser to be upgraded for colorspace support (ie9)
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Amazingly, in 2010, the only correctly color managed browser on windows is still Safari as Firefox doesn't support v4 icc monitor profiles and IE9 doesn't color manage at all except for translating between spaces to sRGB which is not very useful. Chrome can be made to color manage on windows apparently with a command line switch. On Macs the situation is better since Safari, Chrome (only correctly on 10.6) and Firefox (only with v2 ICC monitor profiles) all color manage. However, on mobile platforms, not a single browser color manages!

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