Legacy ImageMagick Discussions Archive

You have decided that the pixel at (0,0) is always background. Fine.

yes - exactly - all images have solid backgrounds in this project and are therefore very simple bitmaps

Best regards,
Konrad

Thanks guys!

I have the solution for PHP environment especially for my problem (to have always white background in 1-bit images) - is very simple:
exec("convert input.png -monochrome -colors 2 result.bmp");
$color=exec('convert result.bmp -format "%[pixel: u.p{0,0}]" info:');
if ($color == 'black ...

I found out, that the filter setting "-blur 0x1" dont works with IM 6.8.9-9

With this code:
convert 20701-2757.bmp -colorspace gray -auto-level -threshold 50% -level 0x50% result.bmp
(without filter "-blur 0x1") the bmp file (result.bmp) was created - but the background was black.
http://bogx.de ...

Sorry, but this make me confused:
I made on my linux-server now a simple php file with 2 lines for test:
exec('convert 20701-2756.bmp convert -colorspace gray -monochrome -depth 1 result_1.bmp');
exec('convert 20701-2756.bmp -colorspace gray -auto-level -threshold 50% -blur 0x1 -level 0x50% result ...

is my IM 6.8.9-9 out-dated?
My viewer is "IrfanView"

My IM Version:
Version: ImageMagick 6.8.9-9 Q16 x86_64 2016-09-23 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 ...

Hi fmw42,
convert 20701-2757.bmp -colorspace Gray -auto-level -threshold 50% -blur 0x1 -level 0x50% result.png
the result in your code must be "png" file?

I have changed "result.png" in "result.bmp":
convert 20701-2757.bmp -colorspace Gray -auto-level -threshold 50% -blur 0x1 -level 0x50 ...

background is always homogeneous color (no gradient or color mix),
foreground is text, or text and icon or text, icon and frame - all of those always the same color.

per example:
Input files
1. input1.bmp: background = color1 (dark), foreground = color2 (light)
2. input2.bmp: backgrond = color3 ...

Hi Snibgo,

yes, the source (input) bitmap files have 24 BitsPerPixel with aliasing.

but desired quality of output files is low, very low, per example:
http://bogx.de/media/20670-2615_1bit.bmp
http://bogx.de/media/20672-2627_1bit.bmp

All input multicolor files (whatever their background color is ...

Hi,

to convert a color bitmap to 1-bit (black&white) bmp is simple,
per example in php environment:
@system('convert -colorspace gray -monochrome -depth 1 ' . $sourceColorBmp . ' ' . $oneBitBmp);

I need some help to convert diverse color bitmaps (with dark or light background) to "1-bit" - but ...