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

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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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