Perform grayscale colorspace conversion

samples/grayscale_image.c

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+/*
+ * Programming introduction with the SOD Embedded Image Processing API.
+ * Copyright (C) PixLab | Symisc Systems, https://sod.pixlab.io
+ */
+/*
+* Compile this file together with the SOD embedded source code to generate
+* the executable. For example:
+*
+*  gcc sod.c grayscale_image.c -lm -Ofast -march=native -Wall -std=c99 -o sod_img_proc
+*  
+* Under Microsoft Visual Studio (>= 2015), just drop `sod.c` and its accompanying
+* header files on your source tree and you're done. If you have any trouble
+* integrating SOD in your project, please submit a support request at:
+* https://sod.pixlab.io/support.html
+*/
+/*
+* This simple program is a quick introduction on how to embed and start
+* experimenting with SOD without having to do a lot of tedious
+* reading and configuration.
+*
+* Make sure you have the latest release of SOD from:
+*  https://pixlab.io/downloads
+* The SOD Embedded C/C++ documentation is available at:
+*  https://sod.pixlab.io/api.html
+*/
+#include <stdio.h>
+#include "sod.h"
+/*
+* Grayscale a full color image.
+*/
+int main(int argc, char *argv[])
+{
+	/* Input image (pass a path or use the test image shipped with the samples ZIP archive) */
+	const char *zInput = argc > 1 ? argv[1] : "./test.png";
+	/* Processed output image path */
+	const char *zOut = argc > 2 ? argv[2] : "./out_gray.png";
+	/* Load the input image in full color */
+	sod_img imgIn = sod_img_load_from_file(zInput, SOD_IMG_COLOR /* full color channels */);
+	if (imgIn.data == 0) {
+		/* Invalid path, unsupported format, memory failure, etc. */
+		puts("Cannot load input image..exiting");
+		return 0;
+	}
+	/* 
+	 * Perform grayscale colorspace conversion.
+	 */
+	sod_img gray = sod_grayscale_image(imgIn);
+	/* Save the grayscale image to the specified path */
+	sod_img_save_as_png(gray, zOut);
+	/* Cleanup */
+	sod_free_image(imgIn);
+	sod_free_image(gray);
+	return 0;
+}