rrayr2002 Loc: New Jersey

Camera is Nikon D7000. Just started trying raw shot. I understand that raw are larger files and here is my question. Take dual shot jpeg and raw (nef). Jpeg is 7mp nef is 18mp. Open raw photo, make no changes, save as jpeg and is 1.42mp. Did not use compression that I know of. Why such a dramatic change in MP? Used PSP.

abc1234 Loc: Elk Grove Village, Illinois

Depends upon the settings when saving the jpg. You can select the physical size and resolution. A slider may set the overall quality which is a proxy for file size. You may have chosen the default setting. JPG's compress them selves. If you are doing raws, why are you also doing jpg's?

Leicaflex Loc: Cymru

Saving a file as JPEG (Joint Photographic Experts Group)will automatically compress the file. JPEG is termed as a 'Lossy compression' and the amount of compression can be adjusted, but it discards information it deems not required in the image.
Hope that helps

mikemilton

Most people set the in camera jpg to large/fine which is the full resolution with minimal compression. You undoubtedly either reduced the resolution or increased the compression.

I generally find that exporting to jpg creates a file that is a bit smaller than the in camera which, I assume, is the result of either differences in the exact compression setting or in processing. One wonders if the camera has a bias to speed rather than compression??

Have a try at comparing the two images. You might see some compression artifacts in the smaller one (or not). The actual file size does not necessarily imply *visible* image degradation in JPG. The point above, that information not requited by the image is discarded is really key. At reasonable compression the discarded info really isn't needed by *that* image but be clear to treat that image as final rather than something you will subsequently re-edit (go back to the raw for that) precisely because it is missing info that might be relevant to what you are trying to achieve by re-editing.

Wendy2 Loc: California

If you do not want compression, save as Tiff or PSD. (Not sure what you mean when you say PSP. Is that a photoshop program?)

RaydancePhoto

Paint Shop Pro = PSP

rrayr2002 Loc: New Jersey

I am using Jpeg fine (largest res in camera) and camera saves both on card raw and jpeg. If I am not mistaken cannot print raw so have to convert it to file that will print.

Wendy2 Loc: California

You can print Tiffs

abc1234 Loc: Elk Grove Village, Illinois

One reason for having both is that you can send out the jpg as a proof and do not have to message the raw until you know what the customer wants. Saves a lot of time.

Except for this, I cannot think of why one would shoot both.

You are correct: you cannot print a raw or, for that matter, do anything else with it. The purpose of the raw is to give you all the information the camera sees. When it makes the jpg, with or without the raw, any device or program discards and alters information. You can never do this to a raw. As has been written many times before here, all processing to the raw is non-destructive. The software extracts what amounts to a temporary file from the raw and all edits are made to the temporary file. The software then stores the edits separately from the raw file. Often times this is in the tiny sidecar file. When you want to use the image for a print, website, or whatever, the program then exports the raw file with the format (jpg, tiff or whatever), size, resolution, color space, device profile and compression you want.

Do not use raw simply because the big shots say so. Determine your needs and how much time and effort you want to expend. Then, decide if you want raw, jpg or raw plus jpg. And then the size of your choice.

I hope this helps. Let us know if you have more questions.

Wahawk Loc: NE IA

In PSP when saving as JPG you can set the compression ratio. I have mine set to MINIMUM compression, or BEST QUALITY. It does very little compression and the JPG from RAW would probably be somewhere around 10 or 12mb.

abc1234 Loc: Elk Grove Village, Illinois

A word of caution about jpg's. Every time you save it, the quality gets knocked down a notch. Not so with tif's , psd's or raw's.

Therefore, if you want jpg's for different purposes, save the new versions from the edited raw rather than from the jpg.

deej

Copy don't save new versions

Radioman Loc: Ontario Canada

[quote=rrayr2002]Camera is Nikon D7000. Just started trying raw shot.

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Possibly because rrayr2002 is NOT 'doing raws' - he is 'doing jpg's' and just started trying 'raws'.

georgevedwards Loc: Essex, Maryland.

When using my own Nikon it sure pays to get jpg files with RAW too because Nikon's RAW files are unreadable by any other software than their own and they even say the NEF file for each model is different. "Please also note that the NEF file produced will be different for each camera model. So software compatible with the NEF file from a D300 may not be compatible with the NEF file produced by a D3100." This would seem to prevent anyone else from ever having a NEF RAW processor, including any future Adobe Photoshop versions. I think Nikon shot themselves in the foot with this one.

rrayr2002 Loc: New Jersey

Strange.... PSP and photoshop will open up my nef files but captureNX2 will not.