Reproducing color images as duotones
SIGGRAPH '96 Proceedings of the 23rd annual conference on Computer graphics and interactive techniques
Transferring color to greyscale images
Proceedings of the 29th annual conference on Computer graphics and interactive techniques
IEEE Computer Graphics and Applications
Color image quantization for frame buffer display
SIGGRAPH '82 Proceedings of the 9th annual conference on Computer graphics and interactive techniques
Circular histogram thresholding for color image segmentation
ICDAR '95 Proceedings of the Third International Conference on Document Analysis and Recognition (Volume 2) - Volume 2
"GrabCut": interactive foreground extraction using iterated graph cuts
ACM SIGGRAPH 2004 Papers
Colorization using optimization
ACM SIGGRAPH 2004 Papers
Local Color Transfer via Probabilistic Segmentation by Expectation-Maximization
CVPR '05 Proceedings of the 2005 IEEE Computer Society Conference on Computer Vision and Pattern Recognition (CVPR'05) - Volume 1 - Volume 01
Color2Gray: salience-preserving color removal
ACM SIGGRAPH 2005 Papers
ACM SIGGRAPH 2006 Papers
An efficient PCA-based color transfer method
Journal of Visual Communication and Image Representation
Decolorize: Fast, contrast enhancing, color to grayscale conversion
Pattern Recognition
NPAR '08 Proceedings of the 6th international symposium on Non-photorealistic animation and rendering
Stylized black and white images from photographs
NPAR '08 Proceedings of the 6th international symposium on Non-photorealistic animation and rendering
ACM SIGGRAPH Asia 2008 papers
Semantic colorization with internet images
Proceedings of the 2011 SIGGRAPH Asia Conference
Global contrast based salient region detection
CVPR '11 Proceedings of the 2011 IEEE Conference on Computer Vision and Pattern Recognition
Fast image and video colorization using chrominance blending
IEEE Transactions on Image Processing
Special Section on CANS: Op Art rendering with lines and curves
Computers and Graphics
Computational Aesthetics'08 Proceedings of the Fourth Eurographics conference on Computational Aesthetics in Graphics, Visualization and Imaging
EGSR'05 Proceedings of the Sixteenth Eurographics conference on Rendering Techniques
Artistic minimal rendering with lines and blocks
Graphical Models
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Colour is an important aspect of art. Not only does it give richness to images, but it always provides a means to highlight certain objects. This idea of spot colour has been used extensively in both fine art and commercial illustrations. Many non-photorealistic rendering (NPR) algorithms produce grayscale or monochromatic images with low saturations. In this paper we introduce the idea of spot colour to NPR and propose a simple and automatic algorithm to add spot colour to these rendering styles. The hue is thresholded into colour layers and the most appropriate layer is automatically determined based on factors such as layer region shape and salience. We also consider using an edge-based criterion to colourise the background, which is an effective means of making the foreground stand out. We demonstrate the effectiveness of our approach by adding spot colour to a diverse set of NPR styles.