How to convert a 4-channel image to 3-channel image in an elegant way?
$begingroup$
I have a 4-channel image (RGBA). I want to reduce its channel count from 4 to 3.
The method I am using currently is to Right click and Save as a .png file. After that when I Import it in Mathematica, the channel count is reduced to 3. Is there a more elegant way to do that?
Note: RemoveAlphaChannel function won't work. Because that will change the appearance of the original image (see the example below).
This is a 4-channel picture from ref / AlphaChannel:
img = Import @ "https://i.stack.imgur.com/XvzDc.png"
This is the 3-channel picture which is what I want:
If I use RemoveAlphaChannel, I will get this picture instead:
image-processing image
edited 10 mins ago
Andreas Rejbrand
10314
asked 1 hour ago
VoldikSSVoldikSS
306
$endgroup$
add a comment |
$begingroup$
I have a 4-channel image (RGBA). I want to reduce its channel count from 4 to 3.
The method I am using currently is to Right click and Save as a .png file. After that when I Import it in Mathematica, the channel count is reduced to 3. Is there a more elegant way to do that?
Note: RemoveAlphaChannel function won't work. Because that will change the appearance of the original image (see the example below).
This is a 4-channel picture from ref / AlphaChannel:
img = Import @ "https://i.stack.imgur.com/XvzDc.png"
This is the 3-channel picture which is what I want:
If I use RemoveAlphaChannel, I will get this picture instead:
image-processing image
edited 10 mins ago
Andreas Rejbrand
10314
asked 1 hour ago
VoldikSSVoldikSS
306
$endgroup$
3
$begingroup$
doesRemoveAlphaChannel[img, White]not work for you? it does give 3-channel image (ImageChannels@RemoveAlphaChannel[img, White]is 3).
$endgroup$
– kglr
57 mins ago
$begingroup$
@kglr Yes it works for that situation. It's amazing, thank you.
$endgroup$
– VoldikSS
26 mins ago
add a comment |
$begingroup$
I have a 4-channel image (RGBA). I want to reduce its channel count from 4 to 3.
The method I am using currently is to Right click and Save as a .png file. After that when I Import it in Mathematica, the channel count is reduced to 3. Is there a more elegant way to do that?
Note: RemoveAlphaChannel function won't work. Because that will change the appearance of the original image (see the example below).
This is a 4-channel picture from ref / AlphaChannel:
img = Import @ "https://i.stack.imgur.com/XvzDc.png"
This is the 3-channel picture which is what I want:
If I use RemoveAlphaChannel, I will get this picture instead:
image-processing image
edited 10 mins ago
Andreas Rejbrand
10314
asked 1 hour ago
VoldikSSVoldikSS
306
$endgroup$
I have a 4-channel image (RGBA). I want to reduce its channel count from 4 to 3.
The method I am using currently is to Right click and Save as a .png file. After that when I Import it in Mathematica, the channel count is reduced to 3. Is there a more elegant way to do that?
Note: RemoveAlphaChannel function won't work. Because that will change the appearance of the original image (see the example below).
This is a 4-channel picture from ref / AlphaChannel:
img = Import @ "https://i.stack.imgur.com/XvzDc.png"
This is the 3-channel picture which is what I want:
If I use RemoveAlphaChannel, I will get this picture instead:
image-processing image
image-processing image
edited 10 mins ago
Andreas Rejbrand
10314
asked 1 hour ago
VoldikSSVoldikSS
306
edited 10 mins ago
Andreas Rejbrand
10314
asked 1 hour ago
VoldikSSVoldikSS
306
edited 10 mins ago
Andreas Rejbrand
10314
edited 10 mins ago
Andreas Rejbrand
10314
edited 10 mins ago
Andreas Rejbrand
10314
10314
asked 1 hour ago
VoldikSSVoldikSS
306
asked 1 hour ago
VoldikSSVoldikSS
306
asked 1 hour ago
VoldikSSVoldikSS
306
306
3
$begingroup$
doesRemoveAlphaChannel[img, White]not work for you? it does give 3-channel image (ImageChannels@RemoveAlphaChannel[img, White]is 3).
$endgroup$
– kglr
57 mins ago
$begingroup$
@kglr Yes it works for that situation. It's amazing, thank you.
$endgroup$
– VoldikSS
26 mins ago
add a comment |
3
$begingroup$
doesRemoveAlphaChannel[img, White]not work for you? it does give 3-channel image (ImageChannels@RemoveAlphaChannel[img, White]is 3).
$endgroup$
– kglr
57 mins ago
$begingroup$
@kglr Yes it works for that situation. It's amazing, thank you.
$endgroup$
– VoldikSS
26 mins ago
3
3
$begingroup$
does
RemoveAlphaChannel[img, White] not work for you? it does give 3-channel image ( ImageChannels@RemoveAlphaChannel[img, White] is 3).$endgroup$
– kglr
57 mins ago
$begingroup$
does
RemoveAlphaChannel[img, White] not work for you? it does give 3-channel image ( ImageChannels@RemoveAlphaChannel[img, White] is 3).$endgroup$
– kglr
57 mins ago
$begingroup$
@kglr Yes it works for that situation. It's amazing, thank you.
$endgroup$
– VoldikSS
26 mins ago
$begingroup$
@kglr Yes it works for that situation. It's amazing, thank you.
$endgroup$
– VoldikSS
26 mins ago
add a comment |
1 Answer
1
active
oldest
votes
$begingroup$
The second example from RemoveAlphaChannel:
- Remove opacity by blending with a white background:
img2 = RemoveAlphaChannel[img, White]
ImageChannels /@ {img, img2}
{4, 3}
ColorSeparate /@ {img, img2} // Grid
Row[{Labeled[Framed@AlphaChannel@img, "img", Top],
Labeled[Framed@AlphaChannel@img2, "img2", Top]}]
answered 47 mins ago
kglrkglr
180k9200413
$endgroup$
$begingroup$
Thank you very much @kglr. I wonder ifRemoveAlphaChannel[#, White]&is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)
$endgroup$
– VoldikSS
29 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
add a comment |
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1 Answer
1
active
oldest
votes
1 Answer
1
active
oldest
votes
active
oldest
votes
active
oldest
votes
$begingroup$
The second example from RemoveAlphaChannel:
- Remove opacity by blending with a white background:
img2 = RemoveAlphaChannel[img, White]
ImageChannels /@ {img, img2}
{4, 3}
ColorSeparate /@ {img, img2} // Grid
Row[{Labeled[Framed@AlphaChannel@img, "img", Top],
Labeled[Framed@AlphaChannel@img2, "img2", Top]}]
answered 47 mins ago
kglrkglr
180k9200413
$endgroup$
$begingroup$
Thank you very much @kglr. I wonder ifRemoveAlphaChannel[#, White]&is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)
$endgroup$
– VoldikSS
29 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
add a comment |
$begingroup$
The second example from RemoveAlphaChannel:
- Remove opacity by blending with a white background:
img2 = RemoveAlphaChannel[img, White]
ImageChannels /@ {img, img2}
{4, 3}
ColorSeparate /@ {img, img2} // Grid
Row[{Labeled[Framed@AlphaChannel@img, "img", Top],
Labeled[Framed@AlphaChannel@img2, "img2", Top]}]
answered 47 mins ago
kglrkglr
180k9200413
$endgroup$
$begingroup$
Thank you very much @kglr. I wonder ifRemoveAlphaChannel[#, White]&is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)
$endgroup$
– VoldikSS
29 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
add a comment |
$begingroup$
The second example from RemoveAlphaChannel:
- Remove opacity by blending with a white background:
img2 = RemoveAlphaChannel[img, White]
ImageChannels /@ {img, img2}
{4, 3}
ColorSeparate /@ {img, img2} // Grid
Row[{Labeled[Framed@AlphaChannel@img, "img", Top],
Labeled[Framed@AlphaChannel@img2, "img2", Top]}]
answered 47 mins ago
kglrkglr
180k9200413
$endgroup$
The second example from RemoveAlphaChannel:
- Remove opacity by blending with a white background:
img2 = RemoveAlphaChannel[img, White]
ImageChannels /@ {img, img2}
{4, 3}
ColorSeparate /@ {img, img2} // Grid
Row[{Labeled[Framed@AlphaChannel@img, "img", Top],
Labeled[Framed@AlphaChannel@img2, "img2", Top]}]
answered 47 mins ago
kglrkglr
180k9200413
edited 38 mins ago
answered 47 mins ago
kglrkglr
180k9200413
answered 47 mins ago
kglrkglr
180k9200413
answered 47 mins ago
kglrkglr
180k9200413
180k9200413
$begingroup$
Thank you very much @kglr. I wonder ifRemoveAlphaChannel[#, White]&is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)
$endgroup$
– VoldikSS
29 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
add a comment |
$begingroup$
Thank you very much @kglr. I wonder ifRemoveAlphaChannel[#, White]&is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)
$endgroup$
– VoldikSS
29 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
$begingroup$
Thank you very much @kglr. I wonder if
RemoveAlphaChannel[#, White]& is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)$endgroup$
– VoldikSS
29 mins ago
$begingroup$
Thank you very much @kglr. I wonder if
RemoveAlphaChannel[#, White]& is universal. If it also works for various alpha channels. (I've tried some pictures with different alpha channels and it works, but I am still not sure whether it works for all the cases...)$endgroup$
– VoldikSS
29 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
$begingroup$
@VoldikSS, I am not sure if it works for all cases.
$endgroup$
– kglr
19 mins ago
add a comment |
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3
$begingroup$
does
RemoveAlphaChannel[img, White]not work for you? it does give 3-channel image (ImageChannels@RemoveAlphaChannel[img, White]is 3).$endgroup$
– kglr
57 mins ago
$begingroup$
@kglr Yes it works for that situation. It's amazing, thank you.
$endgroup$
– VoldikSS
26 mins ago