This Transparency from the 1960's had developed a bad color cast. Used Levels set gray point, Lab color, several filters and an edge mask to sharpen the final stage.

This image was scanned from a book that was printed in the pre digital age with all the color balances out resulting in them all being to dark having a heavy green bias. Used Channel Mixer and Lab color mode to adjust color.

One of the 3 graces in Liverpool, a great building duff grayscale. Used Curves to set the shadow and highlights, high pass filter and hialoam sharpening then an edge mask to sharpen.

Transparecy with bad spotting, created a duplicate layer, used gaussian blur, a layer mask then used the eraser over the top layer spots and finally flattened the image.

Converting from Color to grayscale the Highlight/Shadows areas suffered.Used Curves for the highlights, shadows, midtones, then the doge and burn tools. Removed blemishes, then finally made an edge mask then used unsharp mask. In order to match the shades of painting. (lots of shades of blue and red in the painting, blues/reds can be a problem in converting color to grayscale)

Flat image taken from an existing PDF file, extracted into photoshop adjusted with Curves, highpass filter for midtones, edge mask then unsharp mask, in order to look like the original picture. The image was then saved back into the original PDF file.