How to remove a single color from image & make it transparent

[mattius.m]

I want to remove the white from this image, I've adjusted the Levels so the whites are completely white & blacks are completely black. I've gone to the selection tab & tried the 'Select sample colour' but i can't find a way to make it work. I've spent the last 3 hours looking at youtube tutorials, FAQ's & forums yet i have no idea what i'm doing right or wrong, please help.

[mattius.m]

don't worry, i figured it out. I went to filters, then colours, then erase white paper.

i hope this helps someone

[firstdefence]

If this is to overlay an image you could use Blend mode: Multiply this effectively makes white transparent.

Blend mode: Screen does the opposite, that knocks out the black.

[mattius.m]

On 1/2/2019 at 7:58 PM, firstdefence said:

If this is to overlay an image you could use Blend mode: Multiply this effectively makes white transparent.

Blend mode: Screen does the opposite, that knocks out the black.

thank you, that also works well 

[Gary M. Gordon]

On 1/1/2019 at 11:18 PM, mattius.m said:

don't worry, i figured it out. I went to filters, then colours, then erase white paper.

i hope this helps someone

This is great.

But what if the color we want to remove isn't white? Is there a simple way to select a color from an image and just remove a specific color (other than white)?

- Gary Gordon

[v_kyr]

27 minutes ago, Gary M. Gordon said:

But what if the color we want to remove isn't white? Is there a simple way to select a color from an image and just remove a specific color (other than white)?

"Select > Mark Selected Color", adjust the color tolerance and afterwards hit the "delete" key.

[R C-R]

6 hours ago, v_kyr said:

"Select > Mark Selected Color", adjust the color tolerance and afterwards hit the "delete" key.

FWIW, in the US English version it is Selection > Select Sampled Color.... 

[v_kyr]

28 minutes ago, R C-R said:

FWIW, in the US English version it is Selection > Select Sampled Color.... 

Whatever, there is an online help people can look into for more sureness!  

[Pšenda]

1 hour ago, v_kyr said:

Whatever, there is an online help people can look into for more sureness!  

Alternatively, a link to a specific chapter.

https://affinity.help/photo/English.lproj/pages/Selections/selections_sampled.html