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setup
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1 pagesetup
12 /Times-Bold f
(Pammasksharpen User) 2069 1230 w
(Manual) 3289 1230 w
10 /Times-Bold f
(pammasksharpen) 720 1920 w
10 /Times-Roman f
(Updated: 14 June 2006) 720 2076 w
(Table Of Contents) 720 2196 w
10 /Times-Bold f
(NAME) 720 2436 w
10 /Times-Roman f
(pammasksharpen \255 Sharpen an image via an unsharp mask) 720 2592 w
10 /Times-Bold f
(SYNOPSIS) 720 2832 w
(pammasksharpen) 720 2988 w
10 /Times-Roman f
([) 1507 2988 w
10 /Times-Bold f
(\255sharpness=) 1540 2988 w
10 /Times-Italic f
(realnum) 2053 2988 w
10 /Times-Roman f
([) 2411 2988 w
10 /Times-Bold f
(\255threshold=) 2444 2988 w
10 /Times-Italic f
(realnum maskfile) 2940 2988 w
10 /Times-Roman f
([) 3656 2988 w
10 /Times-Italic f
(inputfile) 3689 2988 w
10 /Times-Roman f
(]) 4023 2988 w
(All) 720 3144 w
(options) 881 3144 w
(can) 1209 3144 w
(be) 1380 3144 w
(abbreviated) 1507 3144 w
(to) 2005 3144 w
(their) 2117 3144 w
(shortest) 2334 3144 w
(unique) 2679 3144 w
(prefix.) 2985 3144 w
(You) 3307 3144 w
(may) 3513 3144 w
(use) 3719 3144 w
(two) 3886 3144 w
(hyphens) 4070 3144 w
(instead) 4437 3144 w
(of) 4754 3144 w
(one.) 4871 3144 w
(You may separate an option name and its value with white space instead of an equals sign.) 720 3264 w
10 /Times-Bold f
(EXAMPLES) 720 3504 w
10 /Times-Roman f
(pamgauss 5 5 \255sigma=.7 \255tupletype=GRAYSCALE ) 795 3720 w
10 /S f
(\357) 2878 3720 w
10 /Times-Roman f
(pamtopnm >gauss.pgm) 2952 3720 w
(pnmconvol gauss.pgm myimage.ppm >blurred.ppm) 795 3840 w
(pammasksharpen blurred.ppm myimage.ppm >sharpened.ppm) 795 3960 w
10 /Times-Bold f
(DESCRIPTION) 720 4260 w
10 /Times-Roman f
(This program is part of Netpbm.) 720 4452 w
10 /Times-Bold f
(pammasksharpen) 720 4608 w
10 /Times-Roman f
(reads) 1510 4608 w
(a) 1748 4608 w
(Netpbm) 1820 4608 w
(image) 2170 4608 w
(as) 2442 4608 w
(input) 2553 4608 w
(and) 2787 4608 w
(produces) 2959 4608 w
(a) 3348 4608 w
(sharpened) 3421 4608 w
(version) 3854 4608 w
(of) 4177 4608 w
(it,) 4289 4608 w
(in) 4399 4608 w
(the) 4506 4608 w
(same) 4657 4608 w
(for\255) 4891 4608 w
(mat, as output.) 720 4728 w
(It does this via an unsharp mask, which you supply as another Netpbm image.) 1359 4728 w
(An) 720 4884 w
(unsharp) 871 4884 w
(mask) 1216 4884 w
(is) 1456 4884 w
(generally) 1552 4884 w
(a) 1952 4884 w
(blurred) 2025 4884 w
(version) 2342 4884 w
(of) 2665 4884 w
(the) 2777 4884 w
(original) 2928 4884 w
(image.) 3268 4884 w
(The) 3591 4884 w
(sharpening) 3775 4884 w
(computation) 4242 4884 w
(is) 4771 4884 w
(this:) 4867 4884 w
(Calculate) 720 5004 w
(the) 1127 5004 w
("edgeness") 1279 5004 w
(of) 1751 5004 w
(a) 1864 5004 w
(sample) 1937 5004 w
(in) 2249 5004 w
(the) 2356 5004 w
(input) 2507 5004 w
(image) 2742 5004 w
(as) 3015 5004 w
(the) 3127 5004 w
(signed) 3278 5004 w
(difference) 3568 5004 w
(between) 4000 5004 w
(the) 4361 5004 w
(sample) 4512 5004 w
(value) 4824 5004 w
(and) 720 5124 w
(the) 891 5124 w
(corresponding) 1040 5124 w
(sample) 1638 5124 w
(in) 1948 5124 w
(the) 2053 5124 w
(unsharp) 2202 5124 w
(mask.) 2545 5124 w
(This) 2833 5124 w
(tells) 3038 5124 w
(how) 3232 5124 w
(different) 3432 5124 w
(the) 3803 5124 w
(pixel) 3953 5124 w
(is) 4181 5124 w
(from) 4276 5124 w
(its) 4498 5124 w
(neighbors.) 4621 5124 w
(Add) 720 5244 w
(a) 920 5244 w
(multiple) 992 5244 w
(of) 1354 5244 w
(the) 1465 5244 w
(edgeness) 1615 5244 w
(to) 2003 5244 w
(the) 2109 5244 w
(original) 2259 5244 w
(sample) 2598 5244 w
(to) 2909 5244 w
(get) 3015 5244 w
(the) 3165 5244 w
(corresponding) 3315 5244 w
(output) 3914 5244 w
(sample.) 4198 5244 w
(Clip) 4559 5244 w
(as) 4759 5244 w
(nec\255) 4869 5244 w
(essary.) 720 5364 w
(This) 1051 5364 w
(causes) 1261 5364 w
(pixels) 1553 5364 w
(that) 1824 5364 w
(are) 2006 5364 w
(brighter) 2159 5364 w
(than) 2507 5364 w
(their) 2711 5364 w
(neighbors) 2926 5364 w
(to) 3352 5364 w
(get) 3462 5364 w
(even) 3616 5364 w
(brighter,) 3836 5364 w
(while) 4209 5364 w
(pixels) 4464 5364 w
(that) 4736 5364 w
(are) 4919 5364 w
(dimmer) 720 5484 w
(than) 1074 5484 w
(their) 1289 5484 w
(neighbors) 1515 5484 w
(get) 1952 5484 w
(even) 2116 5484 w
(dimmer.) 2346 5484 w
(This) 2749 5484 w
(makes) 2969 5484 w
(edges) 3266 5484 w
(\255\255) 3535 5484 w
(places) 3643 5484 w
(where) 3934 5484 w
(pixel) 4219 5484 w
(values) 4461 5484 w
(change) 4758 5484 w
(quickly in space \255\255 stand out more.) 720 5604 w
(The unsharp mask must be the same dimensions and have the same maxval as the input image.) 720 5760 w
10 /Times-Bold f
(The Unsharp Mask) 720 6000 w
10 /Times-Roman f
(You usually create the unsharp mask as a gaussian blur) 720 6192 w
(of) 2950 6192 w
(the) 3059 6192 w
(original) 3207 6192 w
(image,) 3544 6192 w
(which) 3839 6192 w
(you) 4109 6192 w
(can) 4285 6192 w
(do) 4449 6192 w
(using) 4575 6192 w
10 /Times-Bold f
(pam\255) 4818 6192 w
(gauss) 720 6312 w
10 /Times-Roman f
(and) 986 6312 w
10 /Times-Bold f
(pnmconvol) 1162 6312 w
10 /Times-Roman f
(as) 1667 6312 w
(in) 1782 6312 w
(the) 1892 6312 w
(example) 2046 6312 w
(above.) 2416 6312 w
(The) 2736 6312 w
(convolution) 2923 6312 w
(kernel) 3433 6312 w
(you) 3714 6312 w
(use) 3896 6312 w
(with) 4061 6312 w
10 /Times-Bold f
(pnmconvol) 4271 6312 w
10 /Times-Roman f
(is) 4776 6312 w
(nor\255) 4874 6312 w
(mally a square with side length an odd number of pixels.) 720 6432 w
(When) 720 6588 w
(you) 985 6588 w
(create) 1162 6588 w
(an) 1426 6588 w
(unsharp) 1548 6588 w
(mask) 1892 6588 w
(like) 2131 6588 w
(this,) 2309 6588 w
(you) 2507 6588 w
(will) 2685 6588 w
(have) 2869 6588 w
(to) 3085 6588 w
(choose) 3191 6588 w
(the) 3496 6588 w
(side) 3646 6588 w
(length) 3835 6588 w
(of) 4113 6588 w
(the) 4224 6588 w
(convolution) 4374 6588 w
(ker\255) 4880 6588 w
(nel.) 720 6708 w
(That) 920 6708 w
(length) 1131 6708 w
(implements) 1409 6708 w
(the) 1904 6708 w
(parameter) 2054 6708 w
(of) 2480 6708 w
(unsharp) 2591 6708 w
(mask) 2935 6708 w
(sharpening) 3174 6708 w
(usually) 3640 6708 w
(known) 3957 6708 w
(as) 4257 6708 w
("radius.") 4367 6708 w
(In) 4770 6708 w
(par\255) 4880 6708 w
(ticular, a radius of R pixels corresponds to a convolution kernel 2R+1 pixels on a side.) 720 6828 w
(Radius is a very important parameter; you can ruin an image with a radius too) 720 6984 w
(large.) 3858 6984 w
(You) 4133 6984 w
(can) 4331 6984 w
(safely) 4495 6984 w
(use) 4759 6984 w
(the) 4918 6984 w
(highest) 720 7104 w
(radius) 1035 7104 w
(with) 1305 7104 w
(an) 1509 7104 w
(inanimate) 1629 7104 w
(object,) 2049 7104 w
(while a human face demands the least.) 2344 7104 w
(Landscapes fall in between.) 3932 7104 w
(But it really depends on the size of the details.) 720 7224 w
(Fine detail needs a smaller radius, or else you may) 2618 7224 w
(obliterate) 4663 7224 w
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2 pagesetup
10 /Times-Roman f
(\255 2 \255) 2797 480 w
(tiny) 720 840 w
(detail) 923 840 w
(of) 1192 840 w
(the) 1322 840 w
(same) 1491 840 w
(size) 1742 840 w
(as) 1943 840 w
(the) 2072 840 w
(Radius) 2240 840 w
(width.) 2564 840 w
(A) 2888 840 w
(large) 3006 840 w
(image) 3251 840 w
(often) 3541 840 w
(has) 3792 840 w
(larger) 3971 840 w
(detail) 4249 840 w
(\(more) 4517 840 w
(pixels) 4801 840 w
(involved\),) 720 960 w
(so) 1157 960 w
(can) 1275 960 w
(use) 1442 960 w
(a) 1605 960 w
(larger) 1679 960 w
(radius.) 1941 960 w
(Radius) 2265 960 w
(and) 2573 960 w
(sharpness) 2747 960 w
(\(see) 3165 960 w
10 /Times-Bold f
(\255sharpness) 3355 960 w
10 /Times-Roman f
(option\)) 3841 960 w
(interact:) 4160 960 w
(reducing) 4517 960 w
(one) 4896 960 w
(allows you to increase the other.) 720 1080 w
10 /Times-Bold f
(OPTIONS) 720 1320 w
(\255sharpness=) 970 1512 w
10 /Times-Italic f
(realnum) 1483 1512 w
10 /Times-Roman f
(This) 1816 1512 w
(specifies) 2030 1512 w
(the) 2415 1512 w
(magnitude) 2573 1512 w
(of) 3031 1512 w
(the) 3150 1512 w
(sharpening.) 3308 1512 w
(It) 3832 1512 w
(is) 3929 1512 w
(the) 4032 1512 w
(multiple) 4190 1512 w
(of) 4560 1512 w
(edgeness) 4680 1512 w
(that gets added to each sample as described above.) 1220 1632 w
10 /Times-Italic f
(realnum) 970 1788 w
10 /Times-Roman f
(is a nonnegative real decimal number.) 1328 1788 w
(Zero means no sharpening at all.) 2897 1788 w
(This parameter is known as "amount" in ImageMagick.) 970 1944 w
(The default is 1.0.) 970 2100 w
(This option was new in Netpbm 10.30 \(October 2005\).) 970 2256 w
(Before that, the sharpness was always 1.0.) 3212 2256 w
10 /Times-Bold f
(\255sharpness=) 970 2412 w
10 /Times-Italic f
(realnum) 1483 2412 w
10 /Times-Roman f
(This) 1816 2412 w
(minimum) 2025 2412 w
(amount) 2446 2412 w
(of) 2777 2412 w
(edgeness) 2891 2412 w
(that) 3282 2412 w
(will) 3463 2412 w
(be) 3650 2412 w
(considered) 3776 2412 w
(edgeness) 4240 2412 w
(at) 4632 2412 w
(all.) 4736 2412 w
(i.e.) 4918 2412 w
(if) 1220 2532 w
(the) 1310 2532 w
(magnitude) 1461 2532 w
(of) 1912 2532 w
(the) 2024 2532 w
(edgeness) 2175 2532 w
(is) 2564 2532 w
(less) 2660 2532 w
(than) 2839 2532 w
(this,) 3040 2532 w
10 /Times-Bold f
(pammasksharpen) 3239 2532 w
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(will) 4030 2532 w
(treat) 4214 2532 w
(the) 4419 2532 w
(edgeness) 4569 2532 w
(as) 4957 2532 w
(zero.) 1220 2652 w
(A nonzero value may be necessary here to avoid speckling in smooth areas.) 970 2808 w
(This is a fraction of the maxval \(so it is in the range [0, 1.0]\).) 970 2964 w
(The default is 0.) 970 3120 w
(This option was new in Netpbm 10.34 \(June 2006\).) 970 3276 w
10 /Times-Bold f
(SEE ALSO) 720 3516 w
10 /Times-Roman f
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10 /Times-Bold f
(HISTORY) 720 3912 w
(pammasksharpen) 720 4104 w
10 /Times-Roman f
(was new in Netpbm 10.23 \(July 2004\).) 1507 4104 w
10 /S1 f
(________________________________________________________________________) 720 4224 w
10 /Times-Bold f
(Table Of Contents) 720 4464 w
10 /LucidaSansUnicode22 f
(\031) 720 4656 w
10 /Times-Roman f
(NAME) 970 4656 w
10 /LucidaSansUnicode22 f
(\031) 720 4812 w
10 /Times-Roman f
(SYNOPSIS) 970 4812 w
10 /LucidaSansUnicode22 f
(\031) 720 4968 w
10 /Times-Roman f
(DESCRIPTION) 970 4968 w
10 /LucidaSansUnicode22 f
(\031) 720 5124 w
10 /Times-Roman f
(HISTORY) 970 5124 w
10 /LucidaSansUnicode22 f
(\031) 720 5280 w
10 /Times-Roman f
(SEE ALSO) 970 5280 w
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