command to change logo color

[again?]

gcolor2 is easiest.
Click on the eye dropper in gcolor2 then the colour in your image.
If the image you are converting only has one colour the -opaque value doesn't really matter. Just use -fuzz 100% to convert all colours.

[vasa1]

AFAICT, gcolor2 won't be in 18.04 which is a pity

gpick is still there.

[satimis]

gcolor2 is easiest.
Click on the eye dropper in gcolor2 then the colour in your image.
If the image you are converting only has one colour the -opaque value doesn't really matter. Just use -fuzz 100% to convert all colours.

Hi,

Just got gcolor2 installed. It is super easy to use. Thanks

satimis

[satimis]

AFAICT, gcolor2 won't be in 18.04 which is a pity

gpick is still there.

Thanks for your information. We'll see what will happen. Maybe when 18.04 published there'll be a new package.

Regards
satimis

[vasa1]

Re.

file:///usr/share/doc/imagemagick-6-common/html/www/convert.html

File not found
...

It may not be present by default but after you successfully run

sudo apt-get install imagemagick-doc

the file (along with a lot more stuff) will be available.

[satimis]

It may not be present by default but after you successfully run

sudo apt-get install imagemagick-doc

the file (along with a lot more stuff) will be available.

Performed following steps;

⟫ convert --version

Version: ImageMagick 6.8.9-9 Q16 x86_64 2017-07-31 http://www.imagemagick.org
Copyright: Copyright (C) 1999-2014 ImageMagick Studio LLC
Features: DPC Modules OpenMP
Delegates: bzlib cairo djvu fftw fontconfig freetype jbig jng jpeg lcms lqr ltdl lzma openexr pangocairo png rsvg tiff wmf x xml zlib

⟫ sudo apt install imagemagick-doc

.....
Processing triggers for doc-base (0.10.7) ...
Processing 1 added doc-base file...
Setting up libjs-jquery (1.11.3+dfsg-4) ...
Setting up imagemagick-doc (8:6.8.9.9-7ubuntu5.9) ...
Setting up javascript-common (11) ...
Setting up libjs-jquery-easing (10-2ubuntu2) ...
Setting up libjs-jquery-mousewheel (10-2ubuntu2) ...
Setting up libjs-jquery-fancybox (10-2ubuntu2) ...

on browser ran
file:///usr/share/doc/imagemagick-6-common/html/www/convert.html

Firefox can’t find the file at /usr/share/doc/imagemagick-6-common/html/www/convert.html.

    Check the file name for capitalization or other typing errors.
    Check to see if the file was moved, renamed or deleted.

file:///usr/share/doc/imagemagick-6.8.9.9-common/html/www/convert.html

Firefox can’t find the file at /usr/share/doc/imagemagick-6.8.9.9-common/html/www/convert.html.

    Check the file name for capitalization or other typing errors.
    Check to see if the file was moved, renamed or deleted.

satimis

[vasa1]

What does

locate convert.html

show?

But please run

sudo updatedb

first.

I see

$ locate convert.html
/usr/share/doc/imagemagick-doc/www/convert.html
$

on 16.04.

And this works on 16.04:

file:///usr/share/doc/imagemagick-doc/www/convert.html

On 18.04, locate convert.html shows:

$ locate convert.html
/usr/share/doc/imagemagick-6-common/html/www/convert.html
$

[dragonfly41]

In my /usr/share/docs .. Ubuntu 16.04
convert.html is found in /usr/share/doc/imagemagick-doc/www/convert.html

...

Incidentally another approach is to use Inkscape to create your logo, save as logo.svg, embed in your page and dynamically change font colour.
I did not find the font you are using, but MathJax_Fraktur is close.

[satimis]

What does

locate convert.html

show?

But please run

sudo updatedb

first.

I see

$ locate convert.html
/usr/share/doc/imagemagick-doc/www/convert.html
$

on 16.04.

And this works on 16.04:

file:///usr/share/doc/imagemagick-doc/www/convert.html

On 18.04, locate convert.html shows:

$ locate convert.html
/usr/share/doc/imagemagick-6-common/html/www/convert.html
$

On browser
file:///usr/share/doc/imagemagick-doc/www/convert.html

ImageMagick Convert Command-line Tool
....

please see attached file screenshot_imagemagick.png

On Terminal
⟫ locate convert.html
no output

⟫ sudo find / -name convert.html

[sudo] password for satimis: 
find: ‘/run/user/1000/gvfs’: Permission denied
/usr/share/doc/imagemagick-doc/www/convert.html
find: ‘/proc/8912’: No such file or directory
find: ‘/proc/8913’: No such file or directory
find: ‘/proc/8914’: No such file or directory
find: ‘/proc/8915’: No such file or directory
find: ‘/proc/8920’: No such file or directory

satimis

[dragonfly41]

For the first attempt probably you did not run
sudo updatedb
before trying locate.
p.s. it may take some minutes to updatedb and locate.

For the second attempt try
sudo find / -type f -name convert.html
p.s. you may still see some permission errors.