Like Photoshop to make thinner

If you select Open File menu, open the photo in a graphics editor. A picture taken on plain background without texture, noise, and shaded areas near the shape you are going to correct, unlock the option Layer from Background group New menu Layer.

The picture with a more complex background would require a different preparation. Using the Lasso tool select the shape with a small amount of background. Use the option Layer via Copy New group to copy a selection to a new layer. The deformation image using the Liquify filter tools, parts of the background near those with whom you work may be changed. After work you restore them from the original image.

Option, Liquify Filter menu open the filter window and check the Show Mesh checkbox. The grid that appears will give you the opportunity to track the progress of transformation.

Turn on the tool Pucker Tool and apply the details of the shapes that you need to reduce. To do this, configure the size of the brush tool to match the width of the adjustable part of the body. The pixels affected by the brush, will move to its center marked with a cross.

The size of the Brush Density parameter depends on the degree of displacement of parts of the picture are at different distances from the center of the brush. When the maximum value of this parameter, the tool will equally act on all pixels under the brush. Putting a small value Density Brush, you weaken the image change in the area of the edges of the brush.

Setting Brush Pressure controls how fast the picture changes. Set this parameter to a small value to be able to follow the transformation process. Place the center of the brush to the selected part of the shape, hold down the left mouse button and wait until the desired degree of change of the image.

To narrow down the shapes you may need the tool Forward Warp tool, which shifts the pixels of the exposed brush in the direction of its movement. The settings of this tool are similar to the parameters of the Pucker Tool. Adjust the size of the Forward Warp Tool under the length of the segment you want to move, select the center of the brush at the edge of a shape and slip an image.

Turn off the visibility of the grid. If one of the parts of photography correction was excessive, restore the original appearance of this fragment using the Reconstruct Tool.

To restore the background, surrounding the figure, create a mask on the layer to which the filter was applied by clicking on the button Add layer mask. Clean the damaged background, filling it with black on the mask using the Brush tool.

Duplicate the layer with the source the option Duplicate Layer menu and Layer mask on it fragments of the figure that appeared from under the layer with "thin" image. This can be done with Clone Stamp tool Tool.

Option Save As File menu save edited photo to a jpg file.