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[jcasique]

Hi everyone, I want to create a C program on AIX system to read image from a database in TIFF format and then resize, convert to JPG and finally write in file, I think i can use MagickWand to do it, but i don't have enough documentation, does anybody help with that.

Thank

[el_supremo]

Here's a C function which should get you started.
It reads in a TIFF, determines its dimensions, cuts them in half and resizes the image.
The image is then written as a high-quality JPG.

Code: Select all

/*
	Read a TIFF, cut its dimension in half using a Lanczos filter,
	set the image compression quality to 95 and write the result as
	a JPG

*/
#include <windows.h>
#include <wand/magick_wand.h>

void test_wand(void)
{
	MagickWand *m_wand = NULL;

	int width,height;

	MagickWandGenesis();

	m_wand = NewMagickWand();
	// Read the image
	MagickReadImage(m_wand,"input.tiff");
	
	// Get the image's width and height
	width = MagickGetImageWidth(m_wand);
	height = MagickGetImageHeight(m_wand);
	
	// Cut them in half but make sure they don't underflow
	if((width /= 2) < 1)width = 1;
	if((height /= 2) < 1)height = 1;

	// Resize the image
	// The filter is one of:
	//%    Bessel   Blackman   Box
	//%    Catrom   Cubic      Gaussian
	//%    Hanning  Hermite    Lanczos
	//%    Mitchell Point      Quandratic
	//%    Sinc     Triangle
	// The blur factor is a "double", where > 1 is blurry, < 1 is sharp
	MagickResizeImage(m_wand,width,height,LanczosFilter,0.5);

	// Set the compression quality to 95 (high quality = low compression)
	MagickSetImageCompressionQuality(m_wand,95);
	/* Write the new image */
	MagickWriteImage(m_wand,"output.jpg");

	/* Clean up */
	if(m_wand)m_wand = DestroyMagickWand(m_wand);

	MagickWandTerminus();
}

Pete

[jcasique]

Hi, I test the example you post me, but I got this error during the compilation

"/usr/local/include/ImageMagick/magick/quantum.h", line 101.1: 1506-277 (S) Syntax error: possible missing ';' or ','?
"/usr/local/include/ImageMagick/magick/quantum.h", line 100.8: 1506-485 (S) Parameter declaration list is incompatible with declarator for inline.
"/usr/local/include/ImageMagick/magick/quantum.h", line 130.28: 1506-045 (S) Undeclared identifier quantum.

[el_supremo]

I don't know what could cause that error.
I've just copied the code from my previous message, pasted it back into a C program, and recompiled it with IM V6.4.1 (Q8 DLL version on Windows) and it compiles without error.

Pete