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Advanced Image Effects: Blending, Oil Painting, and More Techniques Explained

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This lecture covers advanced photographic effects, focusing on blending, oil painting, and various image manipulation techniques. Learn how to apply complex effects such as blending images using algorithms, creating smooth transitions, and applying artistic filters like oil painting. We discuss the principles behind green screening, blurring techniques for smoother images, and reflections in pictures. The session also includes practical coding examples for loading images, merging pixels, and applying advanced effects to enhance your image editing skills.

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Advanced Image Effects: Blending, Oil Painting, and More Techniques Explained

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  1. ITEC 109 Lecture 24 Advanced Effects

  2. Review • Basic effects • Loading / Displaying • Solid color pictures • Black/White • Sepia

  3. Halloween • CS version of trick or treating

  4. Objectives • Learn about more complex effects • Blending • Green screening • Blurring • Oil Painting

  5. Blending • Combining pictures = +

  6. Algorithm • Load two pictures of the same size • Create new picture of same size • New picture’s pixels are 50% from first picture, 50% from the second

  7. Code def blend(one, two): f = one.get2DArray(); s = two.get2DArray(); last = new Picture(len(f),len(f[0])); result = last.get2DArray(); for i in range(0, len(f)): for j in range(0, len(f(i)): r1 = f[i][j].getRed(); g1 = f[i][j].getGreen(); b1 = f[i][j].getBlue(); r2 = s[i][j].getRed(); g2 = s[i][j].getGreen(); b2 = s[i][j].getBlue(); result[i][j].setRed( r1/2 + r2/2); result[i][j].setGreen( g1/2 + g2/2); result[i][j].setBlue( b1/2 + b2/2); return last;

  8. Mirroring • Make the bottom reflect the top

  9. Code def mirror(pic): val = pic.get2DArray(); width = val[0].length; for i in range (0, len(val)): for j in range(0, len(val(i))): val[i][width-j-1].setRed(val[i][j].getRed()); val[i][width-j-1].setGreen(val[i][j].getGreen()); val[i][width-j-1].setBlue(val[i][j].getBlue());

  10. Blurring • Smoothing type effect • Average r/g/b values around a pixel

  11. Code pixels = input.get2DArray(); output = Picture(pixels.length, pixels[0].length); values = output.get2DArray(); range=2; num=0; for i in range (0,len(pixels)): for j in range (0, len(pixels[i])): r = pixels[i][j].getRed(); g = pixels[i][j].getGreen(); b = pixels[i][j].getBlue(); num=1; for a in range(i-range, i+range) for c in range(j-range, j+range ): if (a > 0 and a < len(pixels) and c > 0 and c<len(pixels[a]) and & a !=i && c !=j) : r += pixels[a][c].getRed(); g += pixels[a][c].getGreen(); b += pixels[a][c].getBlue(); num++ r=r/num; g=g/num; b=b/num; values[i][j].setRed(r); values[i][j].setGreen(g); values[i][j].setBlue(b);

  12. Oil Painting • Blurring to the next level • Make pixels like the ones next to it

  13. Complicated • Range of pixels to look at (radius in a circle) • Calculate intensity of each pixel within range of source pixel • Create X bins for the entire spectrum (i.e. 255/X) • Determine number of pixels in each bin • Target picture’s pixel becomes the average r,g,b values of the pixels in the largest bin

  14. Review • More complicated photography effects • Blending • Oil painting • Much more out there

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