Adobe corporation flagship product Photoshop is used for many different types of projects and purposes. One of the most common uses is seen in the repair, retouching or alteration of photographic images. These changes are intended to repair some perceived flaw in the person photographed. But there are occasions when you want to add blemishes to a photograph rather than remove them. For example, if you are trying to age a person in an image to make him older, you might want to add veins. Fortunately, you can quickly do this in Photoshop.
Load the photograph you want to alter onto your computer either by copying it from some digital source like a camera or flash drive, or by scanning it in at a high resolution--at least 600 DPI (dots per inch).
Open Photoshop. Select "File" from the menu and click "Open." In the dialogue that appears, locate the photograph you loaded and open it.
Select "Image" from the menu and click "Image Size." In the document dialogue that opens change the "Interposition" to "Bicubic Smoother." Then double or triple the width and height of the image. Click "OK."
Select the "Brush" tool. Choose a softer brush. Set the brush size to 2 or 3 pixels. Change the "Foreground" colour to a greenish-blue.
Click on the "New Layer" icon at the bottom of the "Layers" panel.
Select the "Pen" tool and use it to draw a series of branching paths where you want the veins.
Select the "Path" tab and right-click on the listed path. From the options select "Stroke Path." In the dialogue choose the brush tool and click "OK."
Select the layer in the "Layers" panel and reduce its "Opacity" to 50 per cent.
Select "Image" and click "Image Size." Reduce the size of the image back to what it was.
Select "File" and click "Save." In the dialogue name your file and save it.