Monday, 25 March 2013

Clipping Path


A Clipping Path is a closed vector path or shape used to cut out a 2D image. All that is inside the image will be included after the clipping path is applied, whereas the areas that are outside the image will be cropped / cut automatically. The background can later be changed as per your wish. Applying the clipping path, the image gets a hard or soft edge, depending on the way you want your image to be. 

The inside of the image is defined by its direction. The direction of the image can be reversed. Reversing the direction reverses what is considered inside or outside. An inclusive path is one where what is inside the path corresponds to what will be preserved. An exclusive path includes what is outside the path. A clock-wise path, by convention, that is non-self-intersecting is considered to be an inclusive path.

How to create a Clipping Path automatically?

Photoshop has a Clipping Path Dialogue Box where we have the option of Detect Edges. The Detect Edges option hides the lightest or darkest areas of a graphic, so that it works best when the subject is set against a solid white or black background.

Clipping Path Options

1.       Threshold:- Specifies the darkest pixel value that will define the resulting clipping path. By increasing the value makes pixels more transparent by extending the range of lightness values added to the hidden area
2.       Tolerance:- It shows us how similar a pixel’s lightness value can be. By increasing the value of tolerance, you can remove the unwanted bumps caused by stray pixels that are darker than the Threshold Value. The darkness should be close to the lightness of the Threshold Value. Higher Tolerance values usually create a smoother, looser clipping path, by increasing the range of values near the Tolerance value within which stray darker pixels are included. By decreasing the Tolerance Value, You stiffen the clipping path around smaller variations in value.
3.       Inset Frame:- It helps to shrink the resulting Clipping Path Relative to the clipping path defined by the Threshold and Tolerance Value. The Insert Frame Value does not take the lightness or darkness of the image into account. Instead it only uniformly shrinks the shape of the Clipping Path. Adjusting the Inset Frame value slightly may help hide stray pixels that could not be eliminated by using the Threshold and Tolerance values.
4.       Invert: - It helps switching the visible and hidden areas, by starting the clipping path with the darkest tones.
5.       Include inside Edges:- It helps in making those areas transparent that exist inside the original clipping path. But this will happen only if the lightness value lies within the Threshold and Tolerance Level. By default, the Clipping Path command makes only the outer areas transparent, so use Include Inside Edges to correctly represent “holes” in a graphic. This option works best when the brightness levels of the areas you want to make transparent do not match any areas that needs to be visible.
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