I go to change my render setting (video tab) custom size 200 wide by 150 high
I can put in 200 okay but it will not let me put 150 in. It changes it to a 6.
If I put in 151 it changes it to a 7.
Once I go to 152 it will stay as 152.
However those extra pixels may case distortion
What am i doing wrong?
I can't explain why attempting to enter 150 changes to 6, but I can probably explain why it won't let you choose 150.
Many compression schemes work on blocks of 8x8 pixels and so when using these schemes only sizes which are a multiple of 8 in each direction are legal. I presume you are attempting to render using one of these codecs and so while it will accept 200 (=8x25) it will not accept 150 (=8x18.75) - you will need to use 152 (=8x19) instead.