Hi,
I'm using ImageMagick 5.4.2 on RedHat Linux.
I need to convert a LZW compressed GIF to an
uncompressed JPEG.
I have a GIF image with the following properties:
C:\_media>identify -verbose warning.gif
Image: warning.gif
Format: GIF (CompuServe graphics interchange format)
Class: PseudoClass
Geometry: 150x55
Type: Bilevel
Endianess: Undefined
Colorspace: Gray
Channel depth:
Gray: 1-bit
Channel statistics:
Gray:
Min: 0 (0)
Max: 1 (1)
Mean: 0.455879 (0.455879)
Standard deviation: 0.49805 (0.49805)
Colors: 2
Histogram:
4489: #000000 black
3761: #FFFFFF white
Colormap: 2
0: #000000 black
1: #FFFFFF white
Rendering intent: Undefined
Resolution: 72x72
Units: Undefined
Filesize: 432b
Interlace: None
Background color: white
Border color: rgb(223,223,223)
Matte color: grey74
Transparent color: black
Page geometry: 150x55+0+0
Dispose: Undefined
Compression: LZW
Orientation: Undefined
Signature:
4e8727d16838abde6dbba4f6d31c894cd11985455f8468ce5380ab9b0c734fb8
Tainted: True
User time: 0.000u
Elapsed time: 0:01
Pixels per second: 113.475kb
Here are the sequence of calls I'm using;
image_info = CloneImageInfo(
NULL);
SetImageInfo(
image_info,
False,
&exception);
image = BlobToImage(
image_info,
blob,
length,
&exception);
//blob has the original image buffer
....
clone_info = CloneImageInfo(
image_info);
/* make sure the output type has a delegate (we can
convert it) */
GetExceptionInfo(
exception);
magick_info = GetMagickInfo(
clone_info->magick,
exception);
DetachBlob(
clone_info->blob);
clone_info->blob->extent = length;
clone_info->blob->data=
AcquireMemory(clone_info->blob->extent + 1);
WriteJPEGImage */
status = magick_info->encoder(
clone_info,
image);
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