/usr/share/nip2/compat/7.10/_convert.def is in nip2 7.40.4-1+b3.
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*/
to_matrix x
= to_matrix x.expr, is_Expression x
= x, is_Matrix x
= oo_unary_function to_matrix_op x, is_class x
= tom x, is_real x || is_image x
= error (_ "bad arguments to " ++ "to_matrix")
{
to_matrix_op = Operator "to_matrix" tom Operator_type.COMPOUND false;
tom x
= Matrix (itom x), is_image x
= Matrix [[x]], is_real x
= Matrix [x], is_real_list x
= Matrix x, is_matrix x
= error (_ "bad arguments to " ++ "to_matrix");
itom i
= (im_vips2mask ((double) i)).value,
is_image i && get_bands i == 1
= (im_vips2mask ((double) i'')).value,
is_image i && get_bands i == 3 && get_width i == 1
= error (_ "not 1 band image, or 3 band 1 column image")
{
split = bandsplit i;
i' = im_insert (split?0) (split?1) 1 0;
i'' = im_insert i' (split?2) 2 0;
}
}
/* Try to make an Image ... works for Vector/Matrix/Real, plus image/real
* Special case for Colour ... pull out the colour_space and set Type in the
* image.
*/
to_image x
= to_image x.expr, is_Expression x
= x, is_Image x
= Image (image_set_type
(Image_type.colour_spaces.lookup 0 1 x.colour_space)
(mtoi [x.value])),
is_Colour x
= oo_unary_function to_image_op x, is_class x
= toi x, is_real x || is_image x
= error (_ "bad arguments to " ++ "to_image")
{
to_image_op = Operator "to_image" toi Operator_type.COMPOUND false;
toi x
= Image x, is_image x
= Image (mtoi [[x]]), is_real x
= Image (mtoi [x]), is_real_list x
= Image (mtoi x), is_matrix x
= error (_ "bad arguments to " ++ "to_image");
// [[real]] -> image
mtoi m
= im_mask2vips (Matrix m), width != 3
= joinup (im_mask2vips (Matrix m))
{
width = len m?0;
height = len m;
joinup i
= b1 ++ b2 ++ b3
{
b1 = extract_area 0 0 1 height i;
b2 = extract_area 1 0 1 height i;
b3 = extract_area 2 0 1 height i;
}
}
}
/* Try to make a Colour.
*/
to_colour x
= to_colour x.expr, is_Expression x
= x, is_Colour x
= Colour (colour_space (get_type x)) (map mean (bandsplit (get_image x))),
has_image x && has_type x
= error (_ "bad arguments to " ++ "to_colour")
{
colour_space type
= table.get_name type, table.has_name type
= error (_ "unable to make Colour from " ++ table.get_name type ++
_ " image")
{
table = Image_type.colour_spaces;
}
}
/* Try to make a real.
*/
to_real x
= to_real x.expr, is_Expression x
= to_real x.value, is_class x
= x, is_real x
= abs x, is_complex x
= 1, is_bool x && x
= 0, is_bool x && !x
= error (_ "bad arguments to " ++ "to_real");
/* Try to make a list ... ungroup, basically. Recurse for subgroups.
*/
to_list x
= map to_list x.value, is_Group x
= x;
/* Parse a positive integer.
*/
parse_pint l
= foldl acc 0 l
{
acc sofar ch = sofar * 10 + parse_c ch;
/* Turn a char digit to a number.
*/
parse_c ch
= error (_ "not a digit"), !is_digit ch
= (int) ch - (int) '0';
}
/* Parse an integer, with an optional sign character.
*/
parse_int l
= error (_ "badly formed number"), len parts != 2
= sign * n
{
parts = splitpl [member "+-", is_digit] l;
n = parse_pint parts?1;
sign
= 1, parts?0 == [] || parts?0 == "+"
= -1;
}
/* Parse a float.
* [+-]?[0-9]*([.][0-9]*)?(e[0-9]+)?
*/
parse_float l
= err, len parts != 4
= (ipart + fpart) * 10 ** exp
{
err = error (_ "badly formed number");
parts = splitpl [
member "+-0123456789", member ".0123456789",
member "eE", member "+-0123456789"
] l;
ipart = parse_int parts?0;
fpart
= 0, parts?1 == [];
= err, parts?1?0 != '.'
= parse_pint (tl parts?1) / 10 ** (len parts?1 - 1);
exp
= 0, parts?2 == [] && parts?3 == []
= err, parts?2 == []
= parse_int parts?3;
}
// matrix to convert D65 XYZ to D50 XYZ ... direct conversion, found by
// measuring a macbeth chart in D50 and D65 and doing a LMS to get a matrix
D652D50_direct = Matrix
[[ 1.13529, -0.0604663, -0.0606321 ],
[ 0.0975399, 0.935024, -0.0256156 ],
[ -0.0336428, 0.0414702, 0.994135 ]];
D502D65_direct = D652D50_direct ** -1;
/* Convert normalised XYZ to bradford RGB.
*/
XYZ2RGBbrad = Matrix
[[0.8951, 0.2664, -0.1614],
[-0.7502, 1.7135, 0.0367],
[0.0389, -0.0685, 1.0296]];
/* Convert bradford RGB to normalised XYZ.
*/
RGBbrad2XYZ = XYZ2RGBbrad ** -1;
D93_whitepoint = Vector [89.7400, 100, 130.7700];
D75_whitepoint = Vector [94.9682, 100, 122.5710];
D65_whitepoint = Vector [95.0470, 100, 108.8827];
D55_whitepoint = Vector [95.6831, 100, 92.0871];
D50_whitepoint = Vector [96.4250, 100, 82.4680];
A_whitepoint = Vector [109.8503, 100, 35.5849]; // 2856K
B_whitepoint = Vector [99.0720, 100, 85.2230]; // 4874K
C_whitepoint = Vector [98.0700, 100, 118.2300]; // 6774K
E_whitepoint = Vector [100, 100, 100]; // ill. free
D3250_whitepoint = Vector [105.6590, 100, 45.8501];
Whitepoints = Enum [
["D93", D93_whitepoint],
["D75", D75_whitepoint],
["D65", D65_whitepoint],
["D55", D55_whitepoint],
["D50", D50_whitepoint],
["A", A_whitepoint],
["B", B_whitepoint],
["C", C_whitepoint],
["E", E_whitepoint],
["D3250", D3250_whitepoint]
];
/* Convert D50 XYZ to D65 using the bradford chromatic adaptation approx.
*/
im_D502D65 xyz
= xyz'''
{
xyz' = xyz / D50_whitepoint;
rgb = recomb XYZ2RGBbrad xyz';
// move white in bradford RGB
rgb' = rgb / Vector [0.94, 1.02, 1.33];
xyz'' = recomb RGBbrad2XYZ rgb';
// back to D65
xyz''' = xyz'' * D65_whitepoint;
}
/* Convert D65 XYZ to D50 using the bradford approx.
*/
im_D652D50 xyz
= xyz'''
{
xyz' = xyz / D65_whitepoint;
rgb = recomb XYZ2RGBbrad xyz';
// move white in bradford RGB
rgb' = rgb * Vector [0.94, 1.02, 1.33];
xyz'' = recomb RGBbrad2XYZ rgb';
xyz''' = xyz'' * D50_whitepoint;
}
/* Convert D50 XYZ to Lab.
*/
im_D50XYZ2Lab xyz
= im_XYZ2Lab_temp xyz
D50_whitepoint.value?0
D50_whitepoint.value?1
D50_whitepoint.value?2;
/* Convert D50 Lab to XYZ.
*/
im_D50Lab2XYZ lab
= im_Lab2XYZ_temp lab
D50_whitepoint.value?0
D50_whitepoint.value?1
D50_whitepoint.value?2;
/* ... and mono conversions
*/
im_sRGB2mono in
= (image_set_type Image_type.B_W @
clip2fmt (im_header_int "BandFmt" in) @
recomb (Matrix [[.3, .6, .1]])) in;
im_mono2sRGB in
= image_set_type Image_type.sRGB (in ++ in ++ in);
im_sRGB2Lab in = im_XYZ2Lab (im_sRGB2XYZ in);
im_Lab2sRGB in = im_XYZ2sRGB (im_Lab2XYZ in);
/* apply a func to an image ... make it 1 or 3 bands, and reapply other bands
* on the way out. Except if it's LABPACK.
*/
colour_apply fn x
= fn x, b == 1 || b == 3 || c == Image_coding.LABPACK
= x''
{
b = get_bands x;
c = get_coding x;
first
= extract_bands 0 3 x, b > 3
= extract_bands 0 1 x;
tail
= extract_bands 3 (b - 3) x, b > 3
= extract_bands 1 (b - 1) x;
x' = fn first;
x'' = x' ++ clip2fmt (get_format x') tail;
}
/* Any 1-ary colour op, applied to Vector/Image/Matrix or image
*/
colour_unary fn x
= oo_unary_function colour_op x, is_class x
= colour_apply fn x, is_image x
= colour_apply fn [x], is_real x
= error (_ "bad arguments to " ++ "colour_unary")
{
// COMPOUND_REWRAP ... signal to the colour class to go to image and
// back
colour_op = Operator "colour_unary"
colour_object Operator_type.COMPOUND_REWRAP false;
colour_object x
= colour_real_list x, is_real_list x
= map colour_real_list x, is_matrix x
= colour_apply fn x, is_image x
= error (_ "bad arguments to " ++ "colour_unary");
colour_real_list l
= (to_matrix (fn (float) (to_image (Vector l)).value)).value?0;
}
/* Any symmetric 2-ary colour op, applied to Vector/Image/Matrix or image ...
* name is op name for error messages etc.
*/
colour_binary name fn x y
= oo_binary_function colour_op x y, is_class x
= oo_binary'_function colour_op x y, is_class y
= fn x y, is_image x && is_image y
= error (_ "bad arguments to " ++ name)
{
colour_op = Operator name
colour_object Operator_type.COMPOUND_REWRAP true;
colour_object x y
= fn x y, is_image x && is_image y
= colour_real_list fn x y, is_real_list x && is_real_list y
= map (colour_real_list fn x) y, is_real_list x && is_matrix y
= map (colour_real_list (converse fn) y) x,
is_matrix x && is_real_list y
= map2 (colour_real_list fn) x y, is_matrix x && is_matrix y
= error (_ "bad arguments to " ++ name);
colour_real_list fn l1 l2
= (to_matrix (fn i1 i2)).value?0
{
i1 = (float) (to_image (Vector l1)).value;
i2 = (float) (to_image (Vector l2)).value;
}
}
_colour_conversion_table = [
/* Lines are [space-from, space-to, conversion function]. Could do
* this as a big array, but table lookup feels safer.
*/
[B_W, B_W, image_set_type B_W],
[B_W, XYZ, im_sRGB2XYZ @ im_mono2sRGB @ im_clip],
[B_W, YXY, im_XYZ2Yxy @ im_sRGB2XYZ @ im_mono2sRGB @ im_clip],
[B_W, LAB, im_sRGB2Lab @ im_mono2sRGB @ im_clip],
[B_W, LCH, im_Lab2LCh @ im_sRGB2Lab @ im_mono2sRGB @ im_clip],
[B_W, UCS, im_XYZ2UCS @ im_sRGB2XYZ @ im_mono2sRGB @ im_clip],
[B_W, RGB, im_XYZ2disp @ im_sRGB2XYZ @ im_mono2sRGB @ im_clip],
[B_W, sRGB, im_mono2sRGB @ im_clip],
[B_W, LABQ, im_Lab2LabQ @ im_sRGB2Lab @ im_mono2sRGB @ im_clip],
[B_W, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_sRGB2Lab @
im_mono2sRGB @ im_clip],
[XYZ, B_W, im_sRGB2mono @ im_XYZ2sRGB @ im_clip2f],
[XYZ, XYZ, image_set_type XYZ],
[XYZ, YXY, im_XYZ2Yxy @ im_clip2f],
[XYZ, LAB, im_XYZ2Lab @ im_clip2f],
[XYZ, LCH, im_Lab2LCh @ im_XYZ2Lab],
[XYZ, UCS, im_XYZ2UCS @ im_clip2f],
[XYZ, RGB, im_XYZ2disp @ im_clip2f],
[XYZ, sRGB, im_XYZ2sRGB @ im_clip2f],
[XYZ, LABQ, im_Lab2LabQ @ im_XYZ2Lab @ im_clip2f],
[XYZ, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_XYZ2Lab @ im_clip2f],
[YXY, B_W, im_sRGB2mono @ im_XYZ2sRGB @ im_Yxy2XYZ @ im_clip2f],
[YXY, XYZ, im_Yxy2XYZ @ im_clip2f],
[YXY, YXY, image_set_type YXY],
[YXY, LAB, im_XYZ2Lab @ im_Yxy2XYZ @ im_clip2f],
[YXY, LCH, im_Lab2LCh @ im_XYZ2Lab @ im_Yxy2XYZ @ im_clip2f],
[YXY, UCS, im_XYZ2UCS @ im_Yxy2XYZ @ im_clip2f],
[YXY, RGB, im_XYZ2disp @ im_Yxy2XYZ @ im_clip2f],
[YXY, sRGB, im_XYZ2sRGB @ im_Yxy2XYZ @ im_clip2f],
[YXY, LABQ, im_Lab2LabQ @ im_XYZ2Lab @ im_Yxy2XYZ @ im_clip2f],
[YXY, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_XYZ2Lab @ im_Yxy2XYZ @
im_clip2f],
[LAB, B_W, im_sRGB2mono @ im_Lab2sRGB @ im_Lab2XYZ @ im_clip2f],
[LAB, XYZ, im_Lab2XYZ @ im_clip2f],
[LAB, YXY, im_XYZ2Yxy @ im_Lab2XYZ @ im_clip2f],
[LAB, LAB, image_set_type LAB @ im_clip2f],
[LAB, LCH, im_Lab2LCh @ im_clip2f],
[LAB, UCS, im_Lab2UCS @ im_clip2f],
[LAB, RGB, im_Lab2disp @ im_clip2f],
[LAB, sRGB, im_Lab2sRGB @ im_clip2f],
[LAB, LABQ, im_Lab2LabQ @ im_clip2f],
[LAB, LABS, im_Lab2LabS @ im_clip2f],
[LCH, B_W, im_sRGB2mono @ im_Lab2sRGB @ im_LCh2Lab @ im_clip2f],
[LCH, XYZ, im_Lab2XYZ @ im_LCh2Lab @ im_clip2f],
[LCH, YXY, im_XYZ2Yxy @ im_Lab2sRGB @ im_LCh2Lab @ im_clip2f],
[LCH, LAB, im_LCh2Lab @ im_clip2f],
[LCH, LCH, image_set_type LCH],
[LCH, UCS, im_LCh2UCS @ im_clip2f],
[LCH, RGB, im_Lab2disp @ im_LCh2Lab @ im_clip2f],
[LCH, sRGB, im_Lab2sRGB @ im_LCh2Lab @ im_clip2f],
[LCH, LABQ, im_Lab2LabQ @ im_LCh2Lab @ im_clip2f],
[LCH, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_LCh2Lab @ im_clip2f],
[UCS, B_W, im_sRGB2mono @ im_XYZ2sRGB @ im_UCS2XYZ @ im_clip2f],
[UCS, XYZ, im_UCS2XYZ @ im_clip2f],
[UCS, YXY, im_XYZ2Yxy @ im_Lab2XYZ @ im_UCS2Lab @ im_clip2f],
[UCS, LAB, im_UCS2Lab @ im_clip2f],
[UCS, LCH, im_UCS2LCh @ im_clip2f],
[UCS, UCS, image_set_type UCS],
[UCS, RGB, im_Lab2disp @ im_UCS2Lab @ im_clip2f],
[UCS, sRGB, im_Lab2sRGB @ im_UCS2Lab @ im_clip2f],
[UCS, LABQ, im_Lab2LabQ @ im_UCS2Lab @ im_clip2f],
[UCS, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_UCS2Lab @ im_clip2f],
[RGB, B_W, im_sRGB2mono @ im_XYZ2sRGB @ im_disp2XYZ @ im_clip],
[RGB, XYZ, im_disp2XYZ @ im_clip],
[RGB, YXY, im_XYZ2Yxy @ im_disp2XYZ @ im_clip],
[RGB, LAB, im_disp2Lab @ im_clip],
[RGB, LCH, im_Lab2LCh @ im_disp2Lab @ im_clip],
[RGB, UCS, im_Lab2UCS @ im_disp2Lab @ im_clip],
[RGB, RGB, image_set_type RGB],
[RGB, sRGB, im_XYZ2sRGB @ im_disp2XYZ @ im_clip],
[RGB, LABQ, im_Lab2LabQ @ im_disp2Lab @ im_clip],
[RGB, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_disp2Lab @ im_clip],
[sRGB, B_W, im_sRGB2mono],
[sRGB, XYZ, im_sRGB2XYZ @ im_clip],
[sRGB, YXY, im_XYZ2Yxy @ im_sRGB2XYZ @ im_clip],
[sRGB, LAB, im_sRGB2Lab @ im_clip],
[sRGB, LCH, im_Lab2LCh @ im_sRGB2Lab @ im_clip],
[sRGB, UCS, im_XYZ2UCS @ im_sRGB2XYZ @ im_clip],
[sRGB, RGB, im_XYZ2disp @ im_sRGB2XYZ @ im_clip],
[sRGB, sRGB, image_set_type sRGB],
[sRGB, LABQ, im_Lab2LabQ @ im_sRGB2Lab @ im_clip],
[sRGB, LABS, im_LabQ2LabS @ im_Lab2LabQ @ im_sRGB2Lab @ im_clip],
[LABQ, B_W, im_sRGB2mono @ im_Lab2sRGB @ im_LabQ2Lab],
[LABQ, XYZ, im_Lab2XYZ @ im_LabQ2Lab],
[LABQ, YXY, im_XYZ2Yxy @ im_Lab2XYZ @ im_LabQ2Lab],
[LABQ, LAB, im_LabQ2Lab],
[LABQ, LCH, im_Lab2LCh @ im_LabQ2Lab],
[LABQ, UCS, im_Lab2UCS @ im_LabQ2Lab],
[LABQ, RGB, im_LabQ2disp],
[LABQ, sRGB, im_Lab2sRGB @ im_LabQ2Lab],
[LABQ, LABQ, image_set_type LABQ],
[LABQ, LABS, im_LabQ2LabS],
[LABS, B_W, im_sRGB2mono @ im_Lab2sRGB @ im_LabQ2Lab @
im_LabS2LabQ @ im_clip2s],
[LABS, XYZ, im_Lab2XYZ @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
[LABS, YXY, im_XYZ2Yxy @
im_Lab2XYZ @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
[LABS, LAB, im_LabS2Lab],
[LABS, LCH, im_Lab2LCh @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
[LABS, UCS, im_Lab2UCS @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
[LABS, RGB, im_LabQ2disp @ im_LabS2LabQ @ im_clip2s],
[LABS, sRGB, im_XYZ2sRGB @
im_Lab2XYZ @ im_LabQ2Lab @ im_LabS2LabQ @ im_clip2s],
[LABS, LABQ, im_LabS2LabQ @ im_clip2s],
[LABS, LABS, image_set_type LABS]
]
{
/* From Image_type ... repeat here for brevity. Use same ordering as
* in Colour menu for consistency.
*/
B_W = 1;
XYZ = 12;
YXY = 23;
LAB = 13;
LCH = 19;
UCS = 18;
RGB = 17;
sRGB = 22;
LABQ = 16;
LABS = 21;
}
/* Transform between two colour spaces.
*/
colour_transform from to in
= colour_unary _colour_conversion_table?i?2 in, i >= 0
= error (_ "unable to convert " ++ Image_type.type_names.get_name from ++
_ " to " ++ Image_type.type_names.get_name to)
{
match x = x?0 == from && x?1 == to;
i = index match _colour_conversion_table;
}
/* Transform to a colour space, assuming the type field in the input is
* correct
*/
colour_transform_to to in = colour_transform (get_type in) to in;
/* Given a list of things, try to make them all the same size. Don't change
* the format. Don't touch non-image things.
*/
size_alike l
= map enlarge l
{
max_width = foldr (test_prop has_width get_width) 0 l;
max_height = foldr (test_prop has_height get_height) 0 l;
test_prop has get x best
= best, !has x
= max_pair best (get x);
enlarge x
= embed 0 0 0 max_width max_height x, has_width x
= x;
}
/* Given a list of things, look for 1 band objects and bump them to to n -
* band objects, where n is the maximum number of bands. Don't change the
* format. Don't touch non-image things.
*/
bands_alike l
= map upband l
{
max_bands = foldr (test_prop has_bands get_bands) 0 l;
test_prop has get x best
= best, !has x
= max_pair best (get x);
upband x
= bandjoin (replicate max_bands x),
has_bands x && get_bands x == 1
= x;
}
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