how make all single color pixels with fuzz which partial transparent to transparent or not transparent?

[markonop93]

ImageMagick version

7.1.1-21

Operating system, version and so on

Windows 11

Description

i need to make all partial transparent orange pixel , with fuzz 20% , transparent. or not transparent if easier

so change opacity to 0 or 100 for color hex #FF6D2D only and all other fuzzy color wich match -fuzz 20%

how to do ??

[fmw42]

Please post an example image. Sorry, I do not fully understand your question. You have an image with some transparency. You want to change one color with some tolerance (fuzz) that is opaque to transparence. Is this correct? If not, please explain further.

[markonop93]

sorry for bad language. i need change only pixel of one color (example orange hex #FF6D2D) with fuzz 20% to color and only if the pixels are more or less transparent.

so
pixel orange and has transparent - make full transparent
pixel orange and dont have any transparent - dont change
pixel similar to orange with fuzz and has transparent - make full transparent

image is private but i try to find or make other example later

[fmw42]

Please post an example image.

[fmw42]

try this

Your hex color is:

FF6D2D => 255,109,45. (hex to rgb)

then normalize to range 0 to 1

255/255=1
109/255=0.427
45/255=0.176

So

magick image.png -fuzz 20% -fx "(u.a>0 && u.r==1 && u.g==0.427 && u.b==0.176)?u.a==0:u" result.png

If all your conditions are met, then set alpha to 0 (u.a==0), otherwise keep image (u) unchanged

[snibgo]

fmw42's solution won't work because -fx is not sensitive to -fuzz, and because u.a==0 doesn't set u.a to zero, it merely tests whether u.a is zero. Instead, I suggest:

magick image.png -channel A -fx "(u.a<1 && abs(u.r-1)<0.2 && abs(u.g-0.427)<0.2 && abs(u.b-0.176)<0.2) ? 0 : u.a" +channel result.png

Note that this processes only the alpha channel.

This is difficult to test without an example image. @markonop93, please supply an example input.

[markonop93]

thanks this work

question appears - is easy way to use HEX value rather ?? for example i change color a bit here

is any fx func that help with hex instead manual math ?? eg 0xFF and not 1

[snibgo]

# colours can be used in -fx. For example:

D:\temp>%IMG7%magick xc: -fx "#123 *2" txt:
# ImageMagick pixel enumeration: 1,1,0,65535,srgb
0,0: (8738,17476,26214)  #222244446666  srgb(34,68,102)

[markonop93]

yes i mean in your example replace 1, 0.427 and other

is possible ??

[snibgo]

#123 is a colour.

1 in my example above is a (decimal) number.

Numbers are not the same as colours.

-fx does not accept hex numbers. Even if it did, decimal 1 in hex would be 1.

[markonop93]

i know

i ask to replace for easy use in script so i separate for example ff7709 to ff 77 09

but if no possible then i do convert