It will be represented more accurately by a linear gradient that is black at the bottom and white at the top of the photography. The fifth object, the floor, changes its distance continuously. The objects 1 to 4 may be accurately represented by flat silhouettes painted with a solid shade of gray. The top right building, the people crossing the street and the bus, because all of them are at the same distance from the camera. The crowd in front of the top right building.ģ. The closest object represented will be black, the farthest, white and all the other objects in between will be assigned different shades of gray.įirst, analyze the image to isolate the objects.įor this example I defined five objects: 1. The Depth Map is a gray scale representation of the distances from the camera to the objects that are part of the image. To preview the depth of field created with Lens Blur in the sample image, click the LensBlur_s1.jpg thumbnail. The five files will use less than 230KB of your hard disk. Save the images to your hard disk using save target as…Īn alternate method: click the thumbnails and save the full size 510x800 images from your browser. IMAGE LINK: m …enet/tut1/LensBlur_s1.jpg If you already know how to work with PhotoShop CS, go fast over the steps, if you are really new to it consult the program help for details not described here. If you know a better procedure to perform a given task, feel free of use it instead of mine. There are a lot of things about PhotoShop CS that I ignore. I will focus mainly on how to create the Depth Maps and put them in Alpha Channels for their use with the Lens Blur Filter.įollowing this step by step example you will learn the basic principle to apply it to your own pictures. This tutorial will allow you to apply the Lens Blur Filter of PhotoShop CS over a sample image using a Depth Map image provided. The main difference is that the 3D programs automatically calculate the Z-Depth Channel upon request and here the user must use subjective criteria to manually build the Depth Map. I recreated for the Depth Map the procedures used by some 3D modeling and rendering programs to calculate what they call Z-Depth Channel. I am not pretending that the method described below is all mine, neither that it is the best nor the easiest, just that I enjoyed creating the effect this way and it yielded an interesting result. Below are the links to the original image (resized), the alpha channel and the final image after applying The Lens Blur Filter:Ĭounterpoint_rpolitsr_OrigPictur_480.jpgĬounterpoint_rpolitsr_AlphaChann_480.jpgĬounterpoint_rpolitsr_gradualDOF_480.jpgĪfter the kind comments written by Bryan Bedell, BottomBracket, MegaTrixel and abat, I decided to post here a step by step description of the method that I used there, but using a photo that allows a clear description.Įarlier, in the hobby contest, abat posted upon my request an extra image of his beautiful scale model of the HM Bark Endeavour, this post is in retribution to his deference. In the contest thread I briefly described the method used to create it using the Lens Blur Filter and a Depth Map reference built on an Alpha Channel. To better fulfil the challenge requirements, I used PhotoShop CS to create the depth of field in my photo, shot with the Pro1. It began in the POTN G-Series Speed Challenge #32: Point – Counterpointhosted by Bryan Bedell. Spin-Blur: The blurred area is defined by a circle and mimics the motion of an object that is spinning when a photo is taken.Depth Maps for Lens Blur Filter in PhotoShop CS.This option gives the illusion of motion in a still photo. Path-Blur: You can draw a specific path along which the blur will follow. You can adjust the size of the blurred areas and can rotate them, as well as adjusting the strength of the blur. It's often used to create fake miniature scenes.
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