hmm
One method which a lot of new people do is..
Duplicate the layer, Then Image > adjustments > desturate, then erase the centre outwards. of course you’ll learn there are better ways as this one raises bitmap data and pushes your psd file size up. (Personally anything which ramps the file size of a psd higher than it could be i consider as wrong.)
pushes your psd file size up. (Personally anything which ramps the file size of a psd higher than it could be i consider as wrong.)
The best way is to make an adjustment layer called Hue and saturation. Set the saturation to 0.
because that channel is vector data (mainly calculation using a mask you will save a lot of data... for evidence ill use the grapes source image.
abp is the adjustment using another bitmap layer and the updated abp2 has been changed using a hue and saturation adjustment layer.
Notice the big obvious 1 Megabyte file size difference.
If you can avoid using Bitmap data do so. Vector data keeps your file size smaller which is good especially when the layer count hits 100.
I occasionally get sloppy when i am spending hours on a piece and forget to use vector with masks for colouring but its bad not too as bitmap data - especially if used like the top example ramps up the file size.