def get_normalized_spectral_line_colors_annotated (
brightness = 1.0,
num_purples = 0,
dwl_angstroms = 10):
'''Get an array of xyz colors covering the visible spectrum.
Optionally add a number of 'purples', which are colors interpolated between the color
of the lowest wavelength (violet) and the highest (red).
A text string describing the color is supplied for each color.
brightness - Desired maximum rgb component of each color. Default 1.0. (Maxiumum displayable brightness)
num_purples - Number of colors to interpolate in the 'purple' range. Default 0. (No purples)
dwl_angstroms - Wavelength separation, in angstroms (0.1 nm). Default 10 A. (1 nm spacing)
'''
# get range of wavelengths, in angstroms, so that we can have finer resolution than 1 nm
wl_angstrom_range = range (10*start_wl_nm, 10*(end_wl_nm + 1), dwl_angstroms)
# get total point count
num_spectral = len (wl_angstrom_range)
num_points = num_spectral + num_purples
xyzs = numpy.empty ((num_points, 3))
names = []
# build list of normalized color x,y values proceeding along each wavelength
i = 0
for wl_A in wl_angstrom_range:
wl_nm = wl_A * 0.1
xyz = xyz_from_wavelength (wl_nm)
colormodels.xyz_normalize (xyz)
xyzs [i] = xyz
name = '%.1f nm' % wl_nm
names.append (name)
i += 1
# interpolate from end point to start point (filling in the purples)
first_xyz = xyzs [0]
last_xyz = xyzs [num_spectral - 1]
for ipurple in range (0, num_purples):
t = float (ipurple) / float (num_purples - 1)
omt = 1.0 - t
xyz = t * first_xyz + omt * last_xyz
colormodels.xyz_normalize (xyz)
xyzs [i] = xyz
name = '%03d purple' % math.floor (1000.0 * t + 0.5)
names.append (name)
i += 1
# scale each color to have the max rgb component equal to the desired brightness
for i in range (0, num_points):
rgb = colormodels.brightest_rgb_from_xyz (xyzs [i], brightness)
xyzs [i] = colormodels.xyz_from_rgb (rgb)
# done
return (xyzs, names)
def visible_spectrum_table(filename='visible_spectrum.html'):
'''Write an HTML table with the visible spectrum colors.'''
spectrum = ciexyz.empty_spectrum()
(num_wl, num_cols) = spectrum.shape
# get rgb colors for each wavelength
rgb_colors_1 = numpy.empty((num_wl, 3))
rgb_colors_2 = numpy.empty((num_wl, 3))
for i in range(0, num_wl):
xyz = ciexyz.xyz_from_wavelength(spectrum[i][0])
rgb_1 = colormodels.rgb_from_xyz(xyz)
rgb_2 = colormodels.brightest_rgb_from_xyz(xyz)
rgb_colors_1[i] = rgb_1
rgb_colors_2[i] = rgb_2
# scale 1 to make brightest rgb value = 1.0
rgb_max = numpy.max(rgb_colors_1)
scaling = 1.0 / rgb_max
rgb_colors_1 *= scaling
# write HTML file
def write_link(f, url, text):
'''Write an html link.'''
link = '<a href="%s">%s</a><br/>\n' % (url, text)
f.write(link)
f = open(filename, 'w')
# html headers
f.write('<html>\n')
f.write('<head>\n')
f.write('<title>Colors of Pure Spectral Lines</title>\n')
f.write('</head>\n')
f.write('<body>\n')
f.write('<p><h1>Colors of Pure Spectral Lines</h1></p>\n')
f.write('<p>%s</p>\n' %
'White added to undisplayable pure colors to fit into rgb space.')
f.write('<hr/>\n')
# table header
f.write('<table border cellpadding="5">\n')
f.write('<tr>\n')
f.write('<th>Wavelength</th>\n')
f.write('<th>R</th>\n')
f.write('<th>G</th>\n')
f.write('<th>B</th>\n')
f.write('<th>Hex Code</th>\n')
f.write('<th width=200>Full Brightness</th>\n')
f.write('<th width=200>Perceptual Brightness</th>\n')
f.write('</tr>\n')
# each row
for i in range(0, num_wl):
irgb_1 = colormodels.irgb_from_rgb(rgb_colors_1[i])
irgb_2 = colormodels.irgb_from_rgb(rgb_colors_2[i])
red = irgb_2[0]
green = irgb_2[1]
blue = irgb_2[2]
hexstr_1 = colormodels.irgb_string_from_irgb(irgb_1)
hexstr_2 = colormodels.irgb_string_from_irgb(irgb_2)
iwl = spectrum[i][0]
code = '%.1f nm' % iwl
f.write('<tr>\n')
f.write('<td>%s</td>\n' % (code))
f.write('<td>%d</td>\n' % (red))
f.write('<td>%d</td>\n' % (green))
f.write('<td>%d</td>\n' % (blue))
f.write('<td>%s</td>\n' % (hexstr_2))
swatch = " "
f.write('<td bgcolor="%s">%s</td>\n' % (hexstr_2, swatch))
f.write('<td bgcolor="%s">%s</td>\n' % (hexstr_1, swatch))
f.write('</tr>\n')
f.write('</table>\n')
# references
f.write('<hr/>\n')
f.write('<p>References</p>\n')
# one source for data
write_link(f, 'http://goffgrafix.com/pantone-rgb-100.php',
'Goffgrafix.com')
# another source with basically the same data
write_link(f, 'http://www.sandaleo.com/pantone.asp', 'Sandaleo.com')
# one with more colors including metallic (also some errors), not quite consistent with the first two
write_link(
f, 'http://www.loral.org/Z/Colors/100.html',
'Loral.org - Conversions based on CorelDRAW v12 Pantone Solid Coated or Pastel Coated tables and sRGB color space.'
)
# some colors for various sports teams
write_link(
f,
'http://www.pennjersey.info/forums/questions-answers/7895-pantone-colors-colleges-university-mlb-nfl-teams.html',
'Pantone colors for some sports teams.')
# some colors for various national flags
write_link(
f, 'http://desktoppub.about.com/od/colorpalettes/l/aa_flagcolors.htm',
'What color is your flag? Pantone colors for some flags.')
write_link(f,
'http://desktoppub.about.com/library/weekly/blcpflagsrwb.htm',
'Red, White, & Blue - Pantone colors for some flags.')
write_link(
f, 'http://desktoppub.about.com/library/weekly/blcpflagsyellow.htm',
'Yellow or Gold - Pantone colors for some flags.')
write_link(
f, 'http://desktoppub.about.com/library/weekly/blcpflagsgreen.htm',
'Green - Pantone colors for some flags.')
write_link(
f,
'http://desktoppub.about.com/library/weekly/blcpatrioticswatches.htm',
'Color swatches - Pantone colors for some flags.')
# official Pantone webpages
write_link(f,
'http://pantone.com/pages/pantone/Pantone.aspx?pg=19970&ca=25',
'An official PANTONE page')
write_link(f,
'http://pantone.com/pages/products/product.aspx?ca=1&pid=293&',
'Another official PANTONE page')
# html ending
f.write('</body>\n')
f.write('</html>\n')
f.close()
def visible_spectrum_table (filename='visible_spectrum.html'):
'''Write an HTML table with the visible spectrum colors.'''
spectrum = ciexyz.empty_spectrum()
(num_wl, num_cols) = spectrum.shape
# get rgb colors for each wavelength
rgb_colors_1 = numpy.empty ((num_wl, 3))
rgb_colors_2 = numpy.empty ((num_wl, 3))
for i in range (0, num_wl):
xyz = ciexyz.xyz_from_wavelength (spectrum [i][0])
rgb_1 = colormodels.rgb_from_xyz (xyz)
rgb_2 = colormodels.brightest_rgb_from_xyz (xyz)
rgb_colors_1 [i] = rgb_1
rgb_colors_2 [i] = rgb_2
# scale 1 to make brightest rgb value = 1.0
rgb_max = numpy.max (rgb_colors_1)
scaling = 1.0 / rgb_max
rgb_colors_1 *= scaling
# write HTML file
def write_link (f, url, text):
'''Write an html link.'''
link = '<a href="%s">%s</a><br/>\n' % (url, text)
f.write (link)
f = open (filename, 'w')
# html headers
f.write ('<html>\n')
f.write ('<head>\n')
f.write ('<title>Colors of Pure Spectral Lines</title>\n')
f.write ('</head>\n')
f.write ('<body>\n')
f.write ('<p><h1>Colors of Pure Spectral Lines</h1></p>\n')
f.write ('<p>%s</p>\n' % 'White added to undisplayable pure colors to fit into rgb space.')
f.write ('<hr/>\n')
# table header
f.write ('<table border cellpadding="5">\n')
f.write ('<tr>\n')
f.write ('<th>Wavelength</th>\n')
f.write ('<th>R</th>\n')
f.write ('<th>G</th>\n')
f.write ('<th>B</th>\n')
f.write ('<th>Hex Code</th>\n')
f.write ('<th width=200>Full Brightness</th>\n')
f.write ('<th width=200>Perceptual Brightness</th>\n')
f.write ('</tr>\n')
# each row
for i in range (0, num_wl):
irgb_1 = colormodels.irgb_from_rgb (rgb_colors_1 [i])
irgb_2 = colormodels.irgb_from_rgb (rgb_colors_2 [i])
red = irgb_2 [0]
green = irgb_2 [1]
blue = irgb_2 [2]
hexstr_1 = colormodels.irgb_string_from_irgb (irgb_1)
hexstr_2 = colormodels.irgb_string_from_irgb (irgb_2)
iwl = spectrum [i][0]
code = '%.1f nm' % iwl
f.write ('<tr>\n')
f.write ('<td>%s</td>\n' % (code))
f.write ('<td>%d</td>\n' % (red))
f.write ('<td>%d</td>\n' % (green))
f.write ('<td>%d</td>\n' % (blue))
f.write ('<td>%s</td>\n' % (hexstr_2))
swatch = " "
f.write ('<td bgcolor="%s">%s</td>\n' % (hexstr_2, swatch))
f.write ('<td bgcolor="%s">%s</td>\n' % (hexstr_1, swatch))
f.write ('</tr>\n')
f.write ('</table>\n')
# references
f.write ('<hr/>\n')
f.write ('<p>References</p>\n')
# one source for data
write_link (f, 'http://goffgrafix.com/pantone-rgb-100.php', 'Goffgrafix.com')
# another source with basically the same data
write_link (f, 'http://www.sandaleo.com/pantone.asp', 'Sandaleo.com')
# one with more colors including metallic (also some errors), not quite consistent with the first two
write_link (f, 'http://www.loral.org/Z/Colors/100.html',
'Loral.org - Conversions based on CorelDRAW v12 Pantone Solid Coated or Pastel Coated tables and sRGB color space.')
# some colors for various sports teams
write_link (f, 'http://www.pennjersey.info/forums/questions-answers/7895-pantone-colors-colleges-university-mlb-nfl-teams.html',
'Pantone colors for some sports teams.')
# some colors for various national flags
write_link (f, 'http://desktoppub.about.com/od/colorpalettes/l/aa_flagcolors.htm', 'What color is your flag? Pantone colors for some flags.')
write_link (f, 'http://desktoppub.about.com/library/weekly/blcpflagsrwb.htm', 'Red, White, & Blue - Pantone colors for some flags.')
write_link (f, 'http://desktoppub.about.com/library/weekly/blcpflagsyellow.htm', 'Yellow or Gold - Pantone colors for some flags.')
write_link (f, 'http://desktoppub.about.com/library/weekly/blcpflagsgreen.htm', 'Green - Pantone colors for some flags.')
write_link (f, 'http://desktoppub.about.com/library/weekly/blcpatrioticswatches.htm', 'Color swatches - Pantone colors for some flags.')
# official Pantone webpages
write_link (f, 'http://pantone.com/pages/pantone/Pantone.aspx?pg=19970&ca=25', 'An official PANTONE page')
write_link (f, 'http://pantone.com/pages/products/product.aspx?ca=1&pid=293&', 'Another official PANTONE page')
# html ending
f.write ('</body>\n')
f.write ('</html>\n')
f.close()
def get_brightest_irgb_string(xyz):
'''Convert the xyz color to rgb, scale to maximum displayable brightness, and convert to a string.'''
rgb = colormodels.brightest_rgb_from_xyz(xyz)
color_string = colormodels.irgb_string_from_rgb(rgb)
return color_string
def get_brightest_irgb_string (xyz):
'''Convert the xyz color to rgb, scale to maximum displayable brightness, and convert to a string.'''
rgb = colormodels.brightest_rgb_from_xyz (xyz)
color_string = colormodels.irgb_string_from_rgb (rgb)
return color_string
