Apprendre les bases du traitement d'image - Chapitre 1 : introduction

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EdHistogram.o: In function `main':
EdHistogram.c:(.text+0x236): undefined reference to `Reading_ImageHeader'
EdHistogram.c:(.text+0x3a1): undefined reference to `Creation_Image'
EdHistogram.c:(.text+0x4b7): undefined reference to `Creation_Image'
EdHistogram.c:(.text+0x51f): undefined reference to `Reading_ImageData'
EdHistogram.c:(.text+0x6c3): undefined reference to `Writing_ImageData'
EdHistogram.c:(.text+0x720): undefined reference to `Free_Image'
EdHistogram.c:(.text+0x765): undefined reference to `Free_Image'

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EdLibHistogram.o: In function `HistogramPGM':
EdLibHistogram.c:(.text+0x32c): undefined reference to `log'
EdLibHistogram.c:(.text+0x34b): undefined reference to `log'
EdLibHistogram.o: In function `HistogramPPM':
EdLibHistogram.c:(.text+0x70e): undefined reference to `log'
EdLibHistogram.c:(.text+0x72d): undefined reference to `log'
EdLibHistogram.c:(.text+0x9f5): undefined reference to `log'

gcc -o Histogram EdHistogram.o EdLibHistogram.o EdUtilities.o -lm // "-lm", le flag qui sauve !

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if (xscale>0.0 && yscale>0.0) {
	newWidth  = (int)(r.width *xscale);
	newHeight = (int)(r.height*yscale);
}