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Krita is an open source software that is free to download and use
Krita is an open source software that is free to download and use. This program is specifically designed for digital painting, illustrations, comics and matte paintings. The fact that it’s free gives us more advantage as you can use krita for professional and non-commercial purpose. It has numerous features that are found in other digital painting softwares like Krita has a layer system, perspective grid, vector tools and filters.
Krita has a layer system that allows you to create new layers and duplicate the layers that you can use to paint on. You can even import images on the particular layer then use it as a reference.
Another feature that is found in krita is the perspective grid. This feature makes it easier for artists who are just starting their digital painting career so that they will not need assistance from others when doing perspective in their artwork. The perspective grid itself has several presets available like golden mean, rule of thirds and more.

It offers a wide variety of features, including layers, brushes, and filters
Krita has a layer system that is similar to photoshop and other applications of the like. It has many file types like OpenRaster(.ORA), TIFF, PSD, JPEG and PNG. Like many applications that are designed for digital painting, Krita also features a brush system. You can customize your brushes by creating or importing customized brush types and styles. Additionally, Krita has a huge list of filters that can be used to give your work that extra something.
Krita is primarily available on Linux but can be installed on Windows and OS X as well. It offers a wide variety of features, including layers, brushes, and filters.
For more information about Krita, you can see their website at: https://krita.org/
Paint tool SAI is a very popular application for digital painting purposes. First released in 2009, it supports both 32-bit and 64-bit operating systems for Windows and OS X 10.7 and later.
Paint tool SAI has layers and can be used to edit vector editing tools like Adobe Illustrator and Inkscape. It also supports brushes, filters, color pickers, guides, layers, and more.

Paint Tool Sai is a paid software with a one-time fee
Paint Tool Sai is a paid software with a one-time fee. Unlike Krita, this application doesn’t have the ease of creating and importing brushes, layers, filters and more. And unlike Krita, Sai has a very limited layer system that can be used for editing your images before applying filters or effects. The biggest disadvantage of Paint Tool Sai is that you can’t import files from other programs like Photoshop or Gimp in your image. This application is specifically designed for editing photos and graphics images in a professional manner. The free trial of Paint Tool Sai is limited to 30 days. It can be used for both personal and commercial purposes. But, if you want to install the full version of this application, than you have to register it. So, this is a paid software with a one-time fee.
If you want to know more about Paint Tool Sai, then click on the link given below.
https://www.imagemagick.org/Usage/convolve/
http://www.industrialdesigner.net/article/painting-tool-sai-review.html
http://www.howtogeek.com/142247/paintsai-painting-tool-for-the-linux-graphics-desktop/
http://www.thinkwerkz.com/?tag=paintsai&test=allposts

It is known for its high quality and accuracy
Paint Tool Sai is believed to be one of the best digital painting softwares. With its optimized brushes in mind, and its user-friendly interface, this application is a great choice for those who want to create images of high quality. On the other hand, Krita has many custom brushes that are designed with accuracy and quality in mind. Additionally, Krita has a very easy to use interface with a one-click setting option for your images. As for workflow, Krita gives you the flexibility to have multiple layer or an image-wide selection. You can create multiple brush strokes in one image or paint a single area of your image at a time.
When it comes to exporting images, Krita improves on Paints tool Sai by providing an easy way to do the same. The exported images have no grain or noise. You can use layers to keep the complexity of your work in check. When it comes to designing, Krita has a very user-friendly interface and layout. With this app, you can request your artistic design to be completed for you based on your own creative concept.
So there you have it. One is great if you’re a beginner in digital art and the other is great for experienced artists. The choice is yours! Happy painting!
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So which software should you choose for your digital art needs? Read on to find out!
If you are looking to create your own images, then clearly it is better to choose Krita. But if you need a program that is suitable for professional use, then Paint Tool Sai might be the right choice. The only disadvantage of Paint Tool Sai is that you can’t create your own brushes or import Photoshop brushes in your images. But if you don’t mind this limitation, then Paint Tool Sai is the right program for your digital art needs.
In this article I will compare the main features and differences of both Krita and Paint Tool Sai.
Keep in mind as you read that for most digital artists, Krita is considered a freeware, whereas Paint Tool Sai costs around $200 USD. So it is possible to get a lot of work done in Krita or even do some serious professional work with it; while with some other software, such as Photoshop, you can only do a little bit at most because it isn’t so suitable for professional use.
