Legacy ImageMagick Discussions Archive

fmw42 wrote:That is because every pixel has some partial transparency. Sparse-color: will only report perfectly opaque pixels.

Oh, so it's why it responded nothing for this picture. I've thought it's a bug. Thanks for figuring it out for me !

"sparse-color:" is ok for some picture, but respond nothing for some, like this picture :

the minus means send to standard out. You can leave the minus off. Try that and see if both work. If not, post a link to the file that does not work, so others can test with it.

I tried these commands, but nothing was responded :

convert ZA.png -fuzz 80% -transparent white sparse-color ...

fmw42 wrote: convert image -fuzz XX% -transparent white sparse-color:-

I've just tried this command with 2 png files. 1st one ok, the 2nd png give me this error :
Can you please tell me somthing about this ?

Thank you snibgo for the instruction & link.


Do you want just the upper left corner and bounds of the region or do you want to see the coordinates of every pixel that is not white? Yes, I need the coordinate of every pixel.

The latter can be done by simply using txt:- and filtering out all ...

My first question at imageMagick forum was honestly answered by very kind experts.
I hope my 2nd one will be the same. And once again, please correct me if I say something stupid :?

My problem was a bit complicated :

I have some colored texts & graphics on white background, like islands over the ...

convert ^
X.png ^
-set colorspace RGB ^
( +clone -channel Alpha -separate -write mpr:saveAlpha +delete ) ^
( +clone -modulate 100,0,100 mask.txt -compose CopyOpacity -composite -channel Alpha -negate ) ^
-compose Over -composite ^
-channel RGBA ^
-separate ^
mpr:saveAlpha ^
-delete 3 ...

Could you help me please?
I'm not going to fill the point x,y with gray, but going to CONVERT POINT X,Y TO GRAYSCALE.
Maybe not this :
convert image -fill gray -draw "$string" resultimage

But something like this :

convert image -toGrayScale "$string" resultimage

Thanks a lot !

Thanks snibgo, but it seems that you misunderstood my question.
Please read my updated question. Thanks again.

Hi all. This is my first post, thus please forgive my mistakes & my english. I need your helps with this situation:

I have a file with many points' coordinate. The file's content looks like this :

color 1224,257 point color 1224,259 point color 1050,256 point color 1057,256 point color 1058,256 ...