Legacy ImageMagick Discussions Archive

Hi, when i convert a txt image to a png image, it gives me an empty file. How can i get the correct image ?

Below is an example:

# step1. create an test image with one red point
convert -size 2x2 xc:none -fill red -draw 'point 1,1' redPoint.png
# step2. convert the image to a txt file
convert redPoint.png redPoint.txt
# step3. convert the txt file back to png file. But it returned a blank picture and the red point disappeared.
convert redPoint.txt save.png
# step4. convert the txt file to png file with "-alpha off".The red point is displayed again, but it is no longer a transparent image.
convert redPoint.txt -alpha off save.png

Question: How can i convert the txt file to a transparent image with red point (step3)?

Platform:
Distributor ID: Ubuntu
Description: Ubuntu 16.04.5 LTS
Release: 16.04
Codename: xenial
Imagemagick Version:
Version: ImageMagick 6.8.9-9 Q16 x86_64 2018-09-28 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 wmf x xml zlib

It works fine for me, with IM 6.9.9-50. What is in your redPoint.txt? I get:

Code: Select all

# ImageMagick pixel enumeration: 2,2,65535,srgba
0,0: (0,0,0,0)  #00000000  none
1,0: (0,0,0,0)  #00000000  none
0,1: (0,0,0,0)  #00000000  none
1,1: (65535,0,0,65535)  #FF0000FF  red

snibgo wrote: ↑2019-05-07T04:54:17-07:00 It works fine for me, with IM 6.9.9-50. What is in your redPoint.txt? I get:
Code: Select all
# ImageMagick pixel enumeration: 2,2,65535,srgba
0,0: (0,0,0,0)  #00000000  none
1,0: (0,0,0,0)  #00000000  none
0,1: (0,0,0,0)  #00000000  none
1,1: (65535,0,0,65535)  #FF0000FF  red

Thanks for your reply, the contents of redPoint.txt are as follows:

Code: Select all

# ImageMagick pixel enumeration: 2,2,255,srgba
0,0: (0,0,0,0)  #00000000  none
1,0: (0,0,0,0)  #00000000  none
0,1: (0,0,0,0)  #00000000  none
1,1: (255,0,0,1)  #FF0000  red

convert redPoint.png -depth 16 redPoint.txt, I get:

Code: Select all

# ImageMagick pixel enumeration: 2,2,65535,srgba
0,0: (0%,0%,0%,0)  #0000000000000000  none
1,0: (0%,0%,0%,0)  #0000000000000000  none
0,1: (0%,0%,0%,0)  #0000000000000000  none
1,1: (100%,0%,0%,1)  #FFFF00000000  red

It works fine with ImageMagick 6.9.10-27 Q16 of macOS. Is this a bug in IM 6.8.9-9 Q16?

ddosimg wrote:Is this a bug in IM 6.8.9-9 Q16?

I suppose so. I suggest you use a more recent version.

snibgo wrote: ↑2019-05-07T07:01:51-07:00
ddosimg wrote:Is this a bug in IM 6.8.9-9 Q16?
I suppose so. I suggest you use a more recent version.

Thanks for your help.
But ...
If I use IM 6.9.10-27 Q16, I will run into another problem.

https://www.imagemagick.org/discourse-s ... =1&t=35990

How can I solve these two problems at the same time, thank you.

Legacy ImageMagick Discussions Archive

convert txt image to png with transparent gets empty image

convert txt image to png with transparent gets empty image

Re: convert txt image to png with transparent gets empty image

Re: convert txt image to png with transparent gets empty image

Re: convert txt image to png with transparent gets empty image

Re: convert txt image to png with transparent gets empty image