| 48 |
|
return(-1); |
| 49 |
|
} |
| 50 |
|
/* discard header */ |
| 51 |
< |
getheader(input, NULL); |
| 51 |
> |
if (checkheader(input, COLRFMT, NULL) < 0) { |
| 52 |
> |
fprintf(stderr, "%s: not a Radiance picture\n", fname); |
| 53 |
> |
return(-1); |
| 54 |
> |
} |
| 55 |
|
/* get picture dimensions */ |
| 56 |
|
if (fgetresolu(&xres, &yres, input) != (YMAJOR|YDECR)) { |
| 57 |
|
fprintf(stderr, "%s: bad picture size\n", fname); |
| 112 |
|
register int a; |
| 113 |
|
{ |
| 114 |
|
static int cerr[NCOLS][3]; |
| 115 |
< |
static int err[3]; |
| 115 |
> |
static int err[3], errp[3]; |
| 116 |
|
int b; |
| 117 |
|
register int ison; |
| 118 |
|
|
| 119 |
|
b = col[a]; |
| 120 |
+ |
errp[a] = err[a]; |
| 121 |
|
err[a] += b + cerr[x][a]; |
| 122 |
|
ison = err[a] > 128; |
| 123 |
|
if (ison) err[a] -= 256; |
| 124 |
< |
cerr[x][a] = err[a] /= 2; |
| 124 |
> |
err[a] /= 3; |
| 125 |
> |
cerr[x][a] = err[a] + errp[a]; |
| 126 |
|
return(ison); |
| 127 |
|
} |
