Many people like the idea to turn a favourite photo into a drawing made by black pencil or coloured pencils. Real work by hand requires both talent and colossal time. Below are the programs that really do the job well.
This tool — will allow you to process many files at once. It often happens that other programs lag on heavy images, but SoftOrbits Sketch Drawer remains stable even with 20MB+ files. It uses a special contour detector that separates the main object from the background better than usual filters. You can adjust the stroke hardness and even the hatching angle.
Test showed: the “Simple Sketch” preset (it is an old algorithm, but many people like it) renders in less than 1.4 seconds on a regular Intel i5. That is fast. Price is $59.99 USD, but discounts happen regularly, so there is a chance to buy it much cheaper.
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Akvis is usually more expensive; it is for those who value precise texture imitation. A Home Deluxe license costs around $89 USD. The uniqueness is their signature “Maestro” mode, which imitates broad strokes as if painted on a rough canvas. It was tested on a portrait with a complex, curly hairstyle. There are no digital defects like those often found in cheap software. Also, there is a time preview; you can “freeze” the conversion if you need the drawing to look unfinished.
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This free software — is a personal project of one developer, David Thoiron. But it gives a head start to many paid ones. It is written in C++, so it takes up less than 15 MB. There are no neural networks like in expensive ones, but there are 20+ algorithmic scripts. The “Painting 10” script fakes oil pastel well. It is not fast: it rendered a 4K image for almost 12 seconds. But for $0, it is hard to complain. There are no ads, which is generally a rarity for free stuff.
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BeFunky works in the cloud, using servers rather than your graphics card. The “Digital Art” module (available by Plus subscription for $14.99/mo) uses DLX technology (deep learning). Instead of just making it black and white and more contrasty, it rebuilds the geometry of the shot. Tests showed that a 5MB JPEG uploads and processes in about 6 seconds on a good internet connection. This is convenient, but you are renting the tool, not owning it.
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Painnt is heavily focused on style transfer via neural networks. There are more than 2000 filters — a very large amount. The PC version gives high-resolution output but brutally consumes resources, often taking 60-70% of the video card during work. It shows itself best on abstract sketches where realism is not the main thing. The free version puts a watermark; a paid subscription costs about $10 USD per year. It processes shots in tiles and then sews them back together.
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XnSketch — is old software from the creators of XnView. It is simple but very fast. No AI. It uses mathematical matrices to find contours. Because of this, you get a very sharp, contrasty look, like a blueprint or a comic book page. Only 18 effects in total. Test: it processed a folder of 100 shots in less than a minute. Free and works on Linux, Windows, and Mac without problems.
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This is a simplified version of professional Corel Painter, costing about $45. It is made for those who use a graphics tablet (Wacom/Huion). The “Photo Painting” function can convert automatically, but the highlight is the “Cloning” brush, which allows you to manually paint over the shot using its colours. It uses “RealBrush” technology to imitate the physics of a pencil lead. The software is heavy; you need at least 8 GB of RAM.
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