Resizing and Colour change

[TheLads]

I am having trouble with resizing and changing the colour of my image.

I have a jpeg and want to change it to the following requirements:
• The image must be a 100x100 PNG
• The background must be transparent (not white or light gray)
• The only color should be #333333
• There should be no white or any other colors in the picture, only transparent and the main color with various levels of alpha
• There should be as little padding as possible


At the moment this is as far as I have gotten:

Code: Select all

"convert.exe" rose.jpeg -gravity center -extent 100x100! -transparent white -fuzz 99.9%% -set filename:f %%t %%[filename:f].png 

-fill and -opaque are not giving me my desired result.
I am using Windows 7 and ImageMagick-7.0.5-Q16

[snibgo]

There should be no white or any other colors in the picture, only transparent and the main color with various levels of alpha

What should determine the level of alpha?

[TheLads]

To be honest, I am unsure what this means. I have been given these requirements without much explanation

[snibgo]

Creating an image that satisfies the requirements is easy. For example, half the pixels might be #333333 opaque, and the other half fully transparent.

But I suppose the output must be, in some way, dependent on the input.

[TheLads]

https://www.iconfinder.com/icons/298812 ... n#size=128
This is the type of image that would be the input

[snibgo]

I assume your input is one of the PNG files, and your output should have the same transparency (alpha), but all pixels should have the colour #333333. Windows BAT syntax:

Code: Select all

convert ^
  1494360567_link-external.png ^
  -trim +repage ^
  ( -clone 0 -fill #333333 -colorize 100 ) ^
  ( -clone 0 -alpha extract ) ^
  -delete 0 ^
  -alpha off -compose CopyOpacity -composite ^
  -resize "100x100^!" ^
  out.png