Transparent Background for Images with Text

[joshiishan]

I have thousands of images with equations and text with white background. I need to make the white background transparent.

The command I tried as always was:

Code: Select all

convert _VP_EQN_61.GIF.png -fuzz 10% -transparent white _VP_EQN_61-converted.png

This command works perfectly with images without any text but when it comes to images with text, the edges/borders of the text becomes, for the lack of a word, unclear.
Example:
Original Image:
Result Image:

P.S. Please open the image in new tab with any dark background to see the issue clearly. Apologies for not being able to do it here.

I need some help creating images with transparent background with losing the text clarity/quality.

[fmw42]

try

Code: Select all

convert VP-EQN-61-GIF.png -negate -threshold 0 -negate -alpha copy -channel a -negate +channel result.png

[snibgo]

An alternative method results in black text and anti-aliased alpha:

Code: Select all

convert VP-EQN-61-GIF.png -negate -alpha copy -channel RGB -evaluate set 0 +channel out.png

[joshiishan]

try

Code: Select all

convert VP-EQN-61-GIF.png -negate -threshold 0 -negate -alpha copy -channel a -negate +channel result.png

Thanks for your response. It gave me an image with thicker text (like bold) but the text border was not smooth. Attaching the resulting image.
.

It is looking good or fonts which are a bit thicker but not on the thin fonts.

Regards,
Ishan

[joshiishan]

An alternative method results in black text and anti-aliased alpha:

Code: Select all

convert VP-EQN-61-GIF.png -negate -alpha copy -channel RGB -evaluate set 0 +channel out.png

This worked for all my files!

Thanks a lot!