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writeppm: for bitmaps, 1 is black, 0 is white

--- a/sys/src/cmd/jpg/writeppm.c

+++ b/sys/src/cmd/jpg/writeppm.c

@@ -90,6 +90,8 @@

 				pix = (data[i]>>depth*((xmask-x)&xmask))&pmask;

 				if(((x+1)&xmask) == 0)

 					i++;

+				if(chan == GREY1)

+					pix = pix == 1? 0: 1;

 				if(rflag){

 					if(chan == GREY1)

 						Bputbit(fd, pix);

-- 

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