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300 lines
6.8 KiB
Python
Executable file
300 lines
6.8 KiB
Python
Executable file
#!/usr/bin/python
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import sys;
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from numpy import array, zeros, ones, arange, uint32
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from numpy import vstack, hstack, hsplit, dstack, dsplit
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from PIL.Image import frombuffer
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NBITS = 7;
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RESIDBITS = 8-NBITS;
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DIM = 1<<NBITS;
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CONVFACT = 256;
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### target hues
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green = .39; # 11, 22
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yellow = .17; # 23
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red = .04; # 21
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def genbasepal():
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"Generate base palette for highpalookup system. \
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All other palettes must be based on this one."
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imint = zeros([DIM, DIM, DIM], 'uint32');
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for i in range(DIM):
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for j in range(DIM):
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for k in range(DIM):
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imint[i,j,k] = ((i<<16)|(k<<8)|j)<<RESIDBITS;
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imint = hstack(dsplit(imint, DIM));
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imbyte = zeros([DIM, DIM*DIM, 3], 'uint8');
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for i in range(3):
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imbyte[:,:,i] = (imint[:,:,0]>>(i*8))&255;
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return imbyte;
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def getdispimg(im):
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"Get a reshaped version of the palette image IM suitable for viewing."
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# 2^NBITS x 2^NBITS*2^NBITS --> 2^(NBITS + NBITS/2) x 2^NBITS*2^(NBITS - NBITS/2)
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if (im.shape != (DIM, DIM*DIM, 3)):
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raise ValueError("image must have shape (DIM, DIM*DIM, 3)");
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dimfactor = 1<<(NBITS/2);
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return vstack(hsplit(im, dimfactor));
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def getPILimg(im):
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sz = im.shape;
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return frombuffer("RGB", [sz[1], sz[0]], im, "raw", "RGB", 0, 1);
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def saveimage(im, filename):
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getPILimg(im).save(filename);
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def showpalimg(im):
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getPILimg(getdispimg(im)).show();
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### utility functions
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## port of Octave's rbg2hsv
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def rgb2hsv(im):
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if (im.dtype=='uint8'):
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im = imitof(im);
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r, g, b = im[..., 0], im[..., 1], im[..., 2];
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s, v = im.min(2), im.max(2);
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dif = v-s;
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colored = (s != v);
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h = zeros(r.shape, im.dtype);
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# blue hue
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idx = ((v==b) & colored);
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h[idx] = 2./3 + 1./6*(r[idx]-g[idx])/dif[idx];
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# green hue
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idx = ((v==g) & colored);
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h[idx] = 1./3 + 1./6*(b[idx]-r[idx])/dif[idx];
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# red hue
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idx = ((v==r) & colored);
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h[idx] = 1./6*(g[idx]-b[idx])/dif[idx];
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h[idx] %= 1;
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s[~colored] = 0;
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s[colored] = 1.0 - s[colored]/v[colored];
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return dstack((h,s,v));
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## port of Octave's hsv2rbg
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def hsv2rgb(imh):
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imh[imh<0] = 0;
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imh[imh>1] = 1;
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h, s, v = imh[..., 0], imh[..., 1], imh[..., 2];
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rgb = v*(1.0-s);
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rgb = dstack((rgb, rgb, rgb));
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hue = dstack((h-2./3, h, h-1./3))%1;
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f = s*v;
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f = dstack((f, f, f));
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rgb += f * (6.0 * (hue < 1./6)*hue
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+ ((hue >= 1./6) & (hue < 1./2))
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+ ((hue >= 1./2) & (hue < 2./3))*(4.0 - 6.0*hue));
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return imftoi(rgb);
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def imftoi(im):
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im = im.copy();
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if (im.dtype=='uint8'):
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return im
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im *= CONVFACT;
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im[im>255] = 255;
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return im.astype('uint8');
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def imitof(im):
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if (im.dtype=='float32'):
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return im.copy();
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return im.astype('float32')/CONVFACT;
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###
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def genpal(basepal, basepalhsv, pal):
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"Generate a highpalookup image for palette number PAL. \
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BASEPALHSV should the precomputed HSV representation of BASEPAL."
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if (basepal.dtype != 'uint8'):
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raise TypeError('BASEPAL should be uint8.');
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if (pal==0):
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return basepal;
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bph = basepalhsv;
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h,s,v = bph[..., 0], bph[..., 1], bph[..., 2];
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bluemask = (h>0.52) & (h<0.8) & (s>0.2);
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# all true mask will be used unless overridden
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mask = ones(h.shape, 'bool');
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## PHRP r176 defs:
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#
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# tint { pal 1 red 100 green 120 blue 148 flags 1 }
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# tint { pal 2 red 255 green 48 blue 0 flags 0 }
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# tint { pal 4 red 0 green 0 blue 0 flags 0 }
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# tint { pal 6 red 224 green 255 blue 112 flags 3 }
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# tint { pal 7 red 172 green 157 blue 140 flags 0 }
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# tint { pal 8 red 199 green 226 blue 113 flags 1 }
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#
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# bit 1: greyscale (max)
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# bit 2: invert (255-x)
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# colorization: min(int(C*C')/64, 255)
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if (pal in [1,2,4,6,7,8]):
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rgbf = { 1: [100, 120, 148, 1],
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2: [255, 48, 0, 0],
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4: [0, 0, 0, 0],
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6: [224, 255, 112, 3],
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7: [172, 157, 140, 0],
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8: [199, 226, 113, 1]}
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newrgb = basepal.astype('uint32');
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flags = rgbf[pal][3]
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if (flags&1): # greyscale
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newrgb = newrgb.max(2);
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newrgb = dstack((newrgb, newrgb, newrgb)).copy();
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if (flags&2): # invert
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newrgb = 255-newrgb;
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# colorize
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for i in range(3):
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newrgb[:,:,i] *= rgbf[pal][i]
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newrgb[:,:,i] /= 255
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newrgb[newrgb>255] = 255
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return newrgb.astype('uint8');
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# plagman:
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# if (pal==1):
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# h[:] = 0.66;
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# elif (pal==6):
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# h[:] = 0.33;
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# v = 1.0 - v;
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elif (pal==20):
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m1 = ((h>0.6) & (h<0.7));
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m2 = ((h>0.04) & (h<0.13));
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m3 = ((h>0.7) & (h<0.9));
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m4 = ((h>0.3) & (h<0.36));
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mask = m1 | m2 | m3 | m4;
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# blue to gray by removing all saturation
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s[m1] = 0.0;
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# orange and brown to blue
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h[m2] = 0.66;
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# purple and reddish to blue
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h[m3] = 0.66
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# green to blue
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h[m4] = 0.66;
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# helixhorned:
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elif (pal==11):
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mask = bluemask;
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h[mask] = green;
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s[mask] += 0.1;
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elif (pal==12):
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mask = bluemask;
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h[mask] = 0.0;
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s[mask] = 0.0;
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elif (pal==13):
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mask = bluemask;
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h[mask] = 0.0;
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s[mask] = 0.0;
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v[mask] *= 0.7;
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elif (pal==16):
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mask = bluemask;
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s[mask] += 0.1;
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v[mask] -= 0.1;
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elif (pal==21):
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mask = bluemask;
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h[mask] = red;
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s[mask] += 0.3;
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elif (pal==23):
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mask = bluemask;
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h[mask] = yellow;
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s[mask] += 0.12;
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v[mask] *= 1.15;
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elif (pal==99):
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mask = bluemask;
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v[mask] = 0;
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# user:
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# ...
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else:
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raise ValueError("unknown pal {0}!".format(pal));
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# ---
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newrgb = hsv2rgb(dstack((h, s, v)));
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nmask = ~mask;
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r = mask*newrgb[:,:,0] + nmask*basepal[:,:,0];
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g = mask*newrgb[:,:,1] + nmask*basepal[:,:,1];
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b = mask*newrgb[:,:,2] + nmask*basepal[:,:,2];
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# PIL doesn't seem to like views/shallow copies
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return dstack((r, g, b)).copy();
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## main
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if (__name__ == "__main__"):
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argc = len(sys.argv);
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if (argc == 1):
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print "Usage: python prhighpal.py (palnums ...)"
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sys.exit();
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print "Generating base palette..."
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bp = genbasepal();
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bph = rgb2hsv(bp);
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for i in xrange(1, argc):
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palnum = int(sys.argv[i]);
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filename = "hipal{0}_gen.png".format(palnum);
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print "Generating palnum", palnum, "image ...";
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palimg = genpal(bp.copy(), bph.copy(), palnum);
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print "Writing", filename, "...";
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saveimage(palimg, filename);
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print "\nDEF code:\n"
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for i in xrange(1, argc):
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palnum = int(sys.argv[i]);
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if (palnum==0):
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continue;
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filename = "hipal{0}_gen.png".format(palnum);
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print "highpalookup { pal", palnum, "file", filename, "}";
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