Issue with white Logo on transparent background

[mirko-horvacki]

Hi,

I tried to create PNG files from 2 files which can be downloaded from following URL:
https://easyupload.io/m/wz6k6m

Result is not same as in Photoshop - in Photoshop images are white logos on transparent background, but PNG`s created with usage of MagickImage contained only one color - on one case only white, and in second - only transparent.

Here is code snippet used to create PNGs:

MagickReadSettings settingsVectorCheckSize = new MagickReadSettings();
settingsVectorCheckSize.AntiAlias = false;
settingsVectorCheckSize.Density = new Density(imageDPi, DensityUnit.PixelsPerInch);
settingsVectorCheckSize.ColorSpace = ColorSpace.sRGB;
MagickImage imageCheckSize = new MagickImage(byteArray, settingsVectorCheckSize);
imageCheckSize.Format = MagickFormat.Png;

Is it possible to rasterize used AI and PDF to PNG with two colors - white and transparent?

Thanks in advance!

Kind regards,

Mirko

[dlemstra]

Adding images here instead: images.zip

[dlemstra]

This library uses Ghostscript and it seems that it decides to use a white background. We are using the following options:

-q -dQUIET -dSAFER -dBATCH -dNOPAUSE -dNOPROMPT -dMaxBitmap=500000000 -dAlignToPixels=0 -dGridFitTT=2 "-sDEVICE=pngalpha" -dTextAlphaBits=4 -dGraphicsAlphaBits=4 "-r72x72" -dPrinted=false "-sOutputFile=out.png" 1.ai

This is executed through a library or on the command line with gswin64c.exe. If you figure out which option should be added to change the background then I might be able to integrate that into ImageMagick.

[mirko-horvacki]

Asked question on GhostScript site https://bugs.ghostscript.com/show_bug.cgi?id=706294, got answer - files can not be processed correctly with GhostScript.

[dlemstra]

Thanks for the followup and coming back to report your findings