Adding blur to inside of object

The lens blurs will only affect a selected area, where as Gaussian blur will creep outside a selection.

Otherwise keep it simple.   If I want to add some shading to the outer edge of an object, I Ctrl click to load as selection, and Edit > Stroke on a new layer using Centre.  Then turn off the selection and blur the stroke, which while spread outside as well as inside the object boundaries.  So reload the selection, invert it, and delete the unwanted part of the blurred stroke.

There are various adaptions of this that should do what you want, but if you are not sure, paste a screen shot to this thread, and we'll give you a detailed guide.

as they mentioned so many ways to do it:

Selections, Channel manipulation, Mask...can you share a screenshot?

There's several different ways to accomplish this. You could use the blur tool to hand paint a blur on the object. You could make a copy of the layer and blur the whole thing, then apply a layer mask so you only see the inside of the object, or you can make a selection of the object and blur the inside of the object.

All of these methods assume that your object is a pixel layer. Take a screenshot of the object and your layers panel so we can see better what you are trying to do.

Hi Christinam,

As you're looking to blur inside the object, you can make a selection of the object using the Quick Selection tool then apply the blur and it will remain inside the selection.

Could you please share the screenshot of the object with us?

Regards,
Sahil