Starting with a blank canvas, users can choose color themes and pull in tablet-compatible image files that can be controlled as separate layers.

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He then painted a second version of the same image on an identically sized canvas, this time using flat color to produce a drastically different effect.

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After he bought the Calder and the Tomlin, Kirshenbaum wanted a piece by Josef Albers, a German-born Bauhaus artist who pioneered so-called color field painting, in which large blocks of color are spread across a canvas.

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Since most are on paper, which allows oil paint more physical autonomy than absorptive canvas, the results are distinguished by fresh color and light, a palpable sense of immediacy and spontaneity, and a suggestion of transient moments captured and prolonged.

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You load your image of choice into the app, which will then remove all color from it, giving you a grayscale photo canvas.

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As painting became more difficult, he focused intently on the sleek, stylized paper cutouts he had first started experimenting with in the 1930s, using scissors to create the sinewy shapes and swaths of color that he could no longer render directly on canvas.

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And just as Matisse's paeans to the tension between the three-dimensional world and the flat canvas have been dismissed as "decorative" because of their glorious color and patterning, Veronese's lush figure groups have been similarly labeled, for similar reasons.

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