ImageMagick 魔咒：报错

$ convert bMerlin.jpg -font Ubuntu-Bold-Italic \
  -pointsize 56 -fill blue -annotate +25+70 \
  'Merlin, the Wizard of Cats' NewMerlin.jpg

 $ convert -list font 

 $ sudo apt-get install imagemagick 

 $ ./configure --help 

 $ touch catcards $ chmod a+x catcards 

				
---
#!/bin/bash
# A "catcard" bash script for demonstrating ImageMagick
# and generating invitations to a "cat party."
# 20111115 by Bill Zimmerly.

# Find the "seq" command, to generate sequence numbers.

SEQ=`which seq`

# Create the guests file. Comment this
# out if "guests" is an external file.
# (Important Note: "cat" in this script
# has nothing to do with cats!)

cat > guests << EOF
Grandma
Aunt Linda
Uncle Dave
Aunt Rachael
Uncle Joe
Uncle Myk
EOF

# Read the guests into an array called "a."
# (Note: IFS is the field separator value,
# which in this case MUST be set for lines.)

old_IFS=$IFS
IFS=$'\n'
a=($(cat guests))

echo "Generating $((${#a[@]})) invitations to:"

# Generate the invitations.

for i in $($SEQ 0 $((${#a[@]} - 1)))
do
  # Use base=1 for human counting and
  # show it on the console.

  j=i
  ((j += 1))
  echo $j. ${a[$i]}

  # Prepare the file name.

  echo "Merlin"$j".jpg" > filename

  # Prepare the invitational text.

  echo ${a[$i]}", I love you and"       > text1
  echo "I want you to come to my"       > text2
  echo "cat party to scratch my belly." > text3
  echo "Sincerely,"                     > text4
  echo "Merlin"                         > text5

  # Use ImageMagick's "convert" command
  # to generate a new card.

  convert bMerlin.jpg \
    -font Ubuntu-Bold-Italic \
    -pointsize 24 -fill blue \
    -annotate +25+40 $(cat text1) \
    -annotate +25+70 $(cat text2) \
    -annotate +25+100 $(cat text3) \
    -annotate +25+130 $(cat text4) \
    -annotate +25+160 $(cat text5) \
    $(cat filename)

done

# Restore the field separator value and clean up
# temporary files.

IFS=$old_IFS

rm guests
rm filename
rm text1
rm text2
rm text3
rm text4
rm text5

exit 0
---

				
 
$ ./catcards
Generating 6 invitations to:
1. Grandma
2. Aunt Linda
3. Uncle Dave
4. Aunt Rachael
5. Uncle Joe
6. Uncle Myk
$ ls Merlin*

 $ display Merlin1.jpg     .     .     .    Etc. 

				
---
#include <stdio.h>
#include <stdlib.h>
#include <math.h>
#include <wand/MagickWand.h>

int main(int argc,char **argv)
{
#define QuantumScale  ((MagickRealType) 1.0/(MagickRealType) QuantumRange)
#define SigmoidalContrast(x) \
  (QuantumRange*(1.0/(1+exp(10.0*(0.5-QuantumScale*x)))-0.0066928509)*1.0092503)
#define ThrowWandException(wand) \
{ \
  char \
    *description; \
 \
  ExceptionType \
    severity; \
 \
  description=MagickGetException(wand,&severity); \
  (void) fprintf(stderr,"%s %s %lu %s\n",GetMagickModule(),description); \
  description=(char *) MagickRelinquishMemory(description); \
  exit(-1); \
}

  MagickBooleanType
    status;

  MagickPixelPacket
    pixel;

  MagickWand
    *contrast_wand,
    *image_wand;

  PixelIterator
    *contrast_iterator,
    *iterator;

  PixelWand
    **contrast_pixels,
    **pixels;

  register ssize_t
    x;

  size_t
    width;

  ssize_t
    y;

  if (argc != 3)
    {
      (void) fprintf(stdout,"Usage: %s image sigmoidal-image\n",argv[0]);
      exit(0);
    }
  /*
    Read an image.
  */
  MagickWandGenesis();
  image_wand=NewMagickWand();
  status=MagickReadImage(image_wand,argv[1]);
  if (status == MagickFalse)
    ThrowWandException(image_wand);
  contrast_wand=CloneMagickWand(image_wand);
  /*
    Sigmoidal non-linearity contrast control.
  */
  iterator=NewPixelIterator(image_wand);
  contrast_iterator=NewPixelIterator(contrast_wand);
  if ((iterator == (PixelIterator *) NULL) ||
      (contrast_iterator == (PixelIterator *) NULL))
    ThrowWandException(image_wand);
  for (y=0; y < (ssize_t) MagickGetImageHeight(image_wand); y++)
  {
    pixels=PixelGetNextIteratorRow(iterator,&width);
    contrast_pixels=PixelGetNextIteratorRow(contrast_iterator,&width);
    if ((pixels == (PixelWand **) NULL) ||
        (contrast_pixels == (PixelWand **) NULL))
      break;
    for (x=0; x < (ssize_t) width; x++)
    {
      PixelGetMagickColor(pixels[x],&pixel);
      pixel.red=SigmoidalContrast(pixel.red);
      pixel.green=SigmoidalContrast(pixel.green);
      pixel.blue=SigmoidalContrast(pixel.blue);
      pixel.index=SigmoidalContrast(pixel.index);
      PixelSetMagickColor(contrast_pixels[x],&pixel);
    }
    (void) PixelSyncIterator(contrast_iterator);
  }
  if (y < (ssize_t) MagickGetImageHeight(image_wand))
    ThrowWandException(image_wand);
  contrast_iterator=DestroyPixelIterator(contrast_iterator);
  iterator=DestroyPixelIterator(iterator);
  image_wand=DestroyMagickWand(image_wand);
  /*
    Write the image then destroy it.
  */
  status=MagickWriteImages(contrast_wand,argv[2],MagickTrue);
  if (status == MagickFalse)
    ThrowWandException(image_wand);
  contrast_wand=DestroyMagickWand(contrast_wand);
  MagickWandTerminus();
  return(0);
}
---

$ cc `MagickWand-config \
     --cflags --cppflags` \
     -O2 -o wand wand.c \
     `MagickWand-config --ldflags --libs`

 $ ./contrast bMerlin.jpg MerlinX.jpg