this(char[] file, int sizelimit) {
		filename=file.dup;
		gdImage *pic;
		int filesize=cast(int)getSize(file); void[] data=read(file);
		char[] extension=filename[rfind(filename, ".")+1..length];
		if (icmp(extension, "png")==0)
			pic=gdImageCreateFromPngPtr(filesize, data);
		else if ((icmp(extension, "jpg")==0)||(icmp(extension, "jpeg")==0))
			pic=gdImageCreateFromJpegPtr(filesize, data);
		else if (icmp(extension, "gif")==0)
			pic=gdImageCreateFromGifPtr(filesize, data);
		else {
			writeflnt("Was ", extension);
			assert (false);
		}
		delete data[];
		uint thumb_x=sizelimit; uint thumb_y=sizelimit; 
		if (pic.sx>pic.sy)
			thumb_y=cast(uint)(cast(float)sizelimit*(cast(float)pic.sy/cast(float)pic.sx));
		else
			thumb_x=cast(uint)(cast(float)sizelimit*(cast(float)pic.sx/cast(float)pic.sy));
		gdImage *tn=gdImageCreateTrueColor(thumb_x, thumb_y);
		gdImageCopyResampled(tn, pic, 0, 0, 0, 0, thumb_x, thumb_y, pic.sx, pic.sy);
		int size=0; void* buf=gdImagePngPtr(tn, &size);
		pngData.length=size; pngData[]=cast(char[])buf[0..size];
		gdFree(buf);
		gdImageDestroy(tn); gdImageDestroy(pic);
	}