![]() Shader toy implementation I provided is obviously not optimal. Real world lens “busy bokeh” with some ringing visible. Version with a single component produces quite strong ringing, but much more “pronounced” bokeh than Gaussian one: It has a version with a single component and a version with two components (“harmonics”). Results – qualityĪs a proof-of-concept, I implemented it here: . However, in complex domain, one can find whole family of functions (complex phasors multiplied by Gaussian “bell”) that their magnitude is! This is what Olli Niemitalo’s post describes and introduces some “fitted” functions to approximate disk DoF. Unfortunately, there are no circularly symmetric separable filters other than Gaussian filter in real domain. One can try to approximate them, like Guerilla Games in Michal Valient’s Killzone presentation, undersample with blur afterwards like Crytek in Tiago Sousa’s presentation, or try to use some separable approaches like Colin Barré-Brisebois. Working on Far Cry 4 and other titles, I used a different approach – scatter as gather “stretched” Poisson bokeh to compute DoF together with motion blur and at the same time.Ĭircular kernels can be very expensive prone to noise, ringing etc. I wrote a bit about bokeh, DoF and some crazy implementation in Witcher 2 in the past. ![]() Why?įor depth of field effect, Gaussian blurs are seen artistically as “boring”, while hexagonal DoF (popular few years ago) can be subjectively not attractive (artificial, cheap camera qualities). It is direct implementation of “Circularly symmetric convolution and lens blur” by Olli Niemitalo (no innovation on my side, just a toy implementation) and got inspired by Kleber Garcia’s Siggraph 2017 presentation “Circular Separable Convolution Depth of Field”. ![]() Once you've finished editing your photo, you can export it to a JPEG, TIFF, BMP, GIF, or PNG format, or share it using an extensive assortment of services and apps by clicking the Share button in the top left corner of the main screen.Īll things considered, the Blur n Bokeh macOS application is a useful tool have in your image editing ammunition box for when you need to quickly touch up a photo and give it a DSLR look in just a few seconds.This is a short note accompanying shadertoy. ![]() User-friendly and straightforward tool to highlight a photo's subject The side panel also enables you to tweak the foreground's sharpness, clarity, vividness, and warmth levels, and, if you've messed up anything throughout this process, you can rapidly reset them to the default settings using the Reload buttons next to the Background and Foreground titles. If you succeed marking the focus edge, the next step is to click the Apply button in the left side panel and tweak the background's blur, highlights, saturation, and warmth levels until you obtain the perfect result. This being said, it would probably be a good idea if the development team adds a short walkthrough of the editing process within the app screen displayed before loading the image you want to edit. Unfortunately, this will not work as Blur n Bokeh expects you to draw the edge between the subject and background as a single line, and it might frustrating until you figure out how exactly you are supposed to mark out the focus edge. It is important to note that if you don't read the app's description or browse its screenshots, you might want to paint over the entire background. Tweak your photo's background and foreground using the side panel Once you load up an image either by drag and dropping or by clicking the top left corner button, you have to draw up the delimitation between the photo's subject and the background. With the help of Blur n Bokeh, you can quickly draw out a line between the subject which you want to highlight and the background that needs to be blurred or desaturated.īlur n Bokeh comes with an elegant and minimalist user interface which provides you with a viewport and a right side panel containing all the tools you need to direct the attention to the portion of the picture you consider to should be the focus. Drag and drop support and slick looking user interface Image editors with blurring capabilities are the go-to tool if you don't own a DSLR camera which can accurately focus the subject within a photograph or you've just snapped a quick picture, and you need to edit it to give it a DSLR-like look.īlur n Bokeh (formerly known as PicFocus) is a specially designed image editing utility created with this specific purpose in mind, more specifically to help you rapidly and effortlessly bring into focus a particular area in a photo.
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