Legacy ImageMagick Discussions Archive

All right, I found the solution: removing unnecessary line But please tell me if the code could be smarter.

After upgrading IM I noticed meaningful difference in my other composites rendered previously as I expected.

ImageMagick 6.9.2-0 Q16 x64 2015-08-15
http://yarr.strefa.pl/maps/blueyahoo_composite_old.jpg

ImageMagick 7.0.6-0 Q16 x64 2017-06-11
http://yarr.strefa.pl/maps/blueyahoo_composite ...

I reinstalled my Windows IM.
Both commands work:


convert admin_borders.png ^
( oceanmask.png -blur 0x5 -level 99,100%% ) -compose In -composite ^
admin_borders_choked.png

convert admin_borders_choked.png -alpha off -threshold 0 ^
-define connected-components:area-threshold=75 ^
-define ...

PNG* rw- Portable Network Graphics (libpng 1.6.17)

I use Windows but I tried Cygwin also.
No matter what I use - commands don't work.
I will upgrade IM. Maybe it will help.

Thanks.

None of this commands worked.
All right, I will upgrade IM and tell you if it helps.

convert admin_borders.png \
\( oceanmask.png -blur 0x5 -level 99,100% \) -compose In -composite \
admin_borders_choked.png

# first command
convert admin_borders_choked.png -alpha off -threshold 0 \
-define connected-components:area-threshold=75 \
-define connected-components:mean-color=true ...

Fred, both commands produce black image in my environment.

Image: admin_borders_clean.png

Format: PNG (Portable Network Graphics)
Mime type: image/png
Class: DirectClass
Geometry: 1536x864+0+0
Units: Undefined
Type: Grayscale
Base type: Grayscale
Endianess: Undefined
Colorspace: Gray ...

They are both rendered from the same cartographic shape with same compression/palette settings.
I don't know what how to prepare them better.
Maybe it would be easier to cut borders before conversion to grayscale PNG?
(Originals are rendered as black & white images.)
Yes, I know this is not trivial ...

Thank you, Fred.

Generally I use Windows but its scripting environment is too lazy so I often use Cygwin console too.
Sorry for this mixed syntax - I know the difference between systems.

I would like only to preserve white borders between countries .
Shoreline should be removed but it should be ...

Hello

I need to separate and remove shoreline from the administrative boundaries mask.
The best result I achieved with these two commands:

convert admin_borders.png \( oceanmask.png -blur 0x5 -level 99,100% \) \
-compose In -composite admin_borders_choked.png

convert oceanmask.png -background ...

Thank you.

Hello

I need to stretch oval shapes on cartographic bitmaps like this one -
http://anatol.myqnapcloud.com/maps/STARS_6m_30000_proxy.jpg -
in order to avoid distortions while wrapping images on sphere.

Shapes should be stretched horizontally (suppose according to log function):
maximum ...