I have croppped a number of my photos in photoshop cs3 and then clicked save as. I havent changed the file name and so lost the original photo.
I expected a crop of my original photo but photoshop seems to atomatically change the pixels to 72dpi which reduces the size and quality.

Is there anyway of cropping a photo and keeping the original amount of pixels?

I have a 10 mp camera and so its dissapointing that lots of my photos are now only 72dpi because i cropped them in photoshop.

How are you doing the cropping?

If you use the "Crop" Tool, the 'Options' menu bar has a box to select resolution.

'Options' bar for all tools, as selected, is visible when selected via 'Window' on the main top menu.

What other people said!

dpi (dots per inch) is the display resolution and doesn't affect the number of pixels in the image.

A 1024 x 768 image can be 72dpi or 300dpi. If it's at 72dpi it will be 14 inches wide, if it is at 300dpi, it will be 3.42 inches.

It still has the same number of pixels in it.

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You can upscale back to the original pixel size by going into Image Size and upping the resolution back to whatever dpi it was originally.

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Whilst increasing resolution of the digital file, this will not restore the loss of quality of the picture from the low resolution cropping.

No there is no way to crop an image an have the same amount of pixel data.
Unless of course you cut out a picture of the same aspect and then scale it up to the original image size. The CROP word kind of suggests that anyway.

No there is no way to crop an image an have the same amount of pixel data.



The question is about Photoshop.

With the Crop Tool, it is possible to adjust the settings so as to crop an image that starts and finishes with the same number of pixels.

Have you actually used the PS Crop Tool?

Yes i have :)

The question is about Photoshop.

With the Crop Tool, it is possible to adjust the settings so as to crop an image that starts and finishes with the same number of pixels.

That's two operations rolled into one for your convenience, crop and then resize. You irrevocably discard pixel data just like Adaline says.

It's worth reiterating that dpi settings have no effect on image quality. A 10 megapixel image at 72 dpi has exactly the same number of pixels as one at 300dpi.

You can go round in circles as much as you like, but it doesn't solve the OP's problem.

Loss of pixels by cropping in PS can be happening in more than one way.

Most are lost from the excised portion of image. They do not affect the 'quality' of the remaining image.

Of importance to the OP are those lost by having a setting of lower resolution (than that of the original image) in with the cropping tool.
(or keeping the same resolution while letting the Crop Tool enlarge the Image Size (inches etc.))

That is what reduces the "quality" of the cropped image.
It is remedied by altering the settings before cropping.

http://www.scantips.com/no72dpi.html

I think the OP needs to understand what is happening which in contrast to what needs to happen will show the OP the right path and immensely improving their PS (or indeed any other raster editor) skills.
So then cropping aka CUTTING OUT a box from an existing image, this will take the pixels in the box selected and delete everything else. You can then re-sample (scale) the image up, so it has more pixels - whats actually happens is that a new image is created, and the small image is then interpolated (stretched) over the new one. This of course gives you blurry results.
In your crop tool options, you can specify the size (in pixels) of the box you want to cut out, which will do just that. If you say i want a sqaure 300px in size, then select a box 20px in size. Photoshop will cut out 20 pixel box and then scale it to 300px - its just combining 2 operations into 1 to save you time, but this may produce undesired re-sampling effects.
You can also specify the size in inches/mm/cm whatever and specify the sampling resolution, all this does is figure out the actual pixel size based on the physical size you specify. So at 72dpi, an image cropped to f 1inch x 1nch will be 72x72 pixels, that is it will be sampled at 72 dots per every inch - this is only useful in print.

I know that cropping a picture looses some pixels but I didn't know about the settings and options. I am begining to understand more about dpi as to be honest I didnt know the settings could change picture size etc.
Thanks everyone...... I find the experienced photoshopers are very helpful and informative.