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i am new to Blender , i render text object with shadow catcher , but fount it was so messy compared to the one without shadow catcher

Here is the original complete one Original one

Here is the one with shadow catcher one with shadow cather

As you can see ,shadow effect is messy and darker

what i have tried to solve this ?

1.I use composite node to separate shadow and object and decrease the intensity of shadow , but i meet such new problem!There is white edge !! enter image description here enter image description here

2.maybe i can create a duplicated text object and offset to inside direction and use that one's shadow to avoid white edge , but it is so troublesome..

3.maybe i can try to separate alpha of object and subtract it with shadow catcher one , and then affect shadow so that avoid white edge , but it is troublesome too

Is there any efficient method to make shadow catcher effect smoother and more beautiful?

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Super-ilad
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    the most common use for shadow catchers is compositing 3D rendered objects on top of real/preexisting footage. Seems like your scene is completely CG – is there a specific reason you are using a shadow catcher? – bstnhnsl Feb 23 '20 at 09:45
  • Well, generate multiple object PNG render images in Python , maybe 10 thousands single image, so i must need shadow catcher – Super-ilad Feb 23 '20 at 09:51

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