Each individual image differs in tonal range and contrast. Therefore, no one curve can achieve perfect or even good results for every scan. Fine tuning of the curve and use of other features such as sharpening or unsharp masking may be required. If you are going to use Adobe Photoshop to generate or adjust images, it would be a very good idea to receive some formal training in its use. At the very least you should read the manual and practice on some test images.
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