RemoveAlphaChannel

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`RemoveAlphaChannel`

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RemoveAlphaChannel[color]

removes opacity from color.

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RemoveAlphaChannel[color,bg]

removes opacity by blending color with the background color bg.

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RemoveAlphaChannel[image,…]

removes opacity from all pixels in image.

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RemoveAlphaChannel[video,…]

removes opacity from frames of video.

Details

RemoveAlphaChannel returns an image or a color without an opacity value or alpha channel, either dropping or blending the colors with a specified background color.

RemoveAlphaChannel returns the original color or image if it does not contain an alpha channel.
When blending with a background color, an RGB or grayscale color or image is always returned.
RemoveAlphaChannel works with any valid color directive as well as 2D and 3D images.

Examples

open allclose all

Basic Examples (3)Summary of the most common use cases

Remove opacity from a color directive:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-bdk6yx

Out[1]=1

Drop the alpha channel from an image:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-qnqfl

Out[1]=1

Remove opacity by blending with a white background:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-lkqtcu

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0bc6mudgk689qs2-cmkgim

Out[2]=2

Scope (6)Survey of the scope of standard use cases

Remove opacity from a color directive:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-4obl8u

Out[1]=1

Remove an opaque mask from a grayscale image:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-gvhs5i

Out[1]=1

Remove opacity by blending with a pink background:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-fio9d9

Out[1]=1

Remove the alpha channel from a 3D image:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-b3tgjq

Out[1]=1

Blend with a black background:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-u01ba

Out[1]=1

Remove the alpha channel from a video:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-8ddgpz

Out[1]=1

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0bc6mudgk689qs2-81uscc

Out[2]=2

Out[2]=2

Applications (2)Sample problems that can be solved with this function

Replace all transparent colors with fully opaque colors in graphics:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-woe0l3

Out[1]=1

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https://wolfram.com/xid/0bc6mudgk689qs2-4v7g9w

In[2]:=2

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https://wolfram.com/xid/0bc6mudgk689qs2-j3q4hn

Out[2]=2

Create artistic effects using alpha blending:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-j661dj

Out[1]=1

Properties & Relations (2)Properties of the function, and connections to other functions

On an image with no alpha channel, the input image is returned:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-ebhe3z

Out[1]=1

Remove the alpha channel using ColorSeparate followed by ColorCombine:

In[1]:=1

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https://wolfram.com/xid/0bc6mudgk689qs2-4zlf4

Out[1]=1

In[2]:=2

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https://wolfram.com/xid/0bc6mudgk689qs2-enbovv

Out[2]=2

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