>Hi
>
>I stored a picture in blob field and I am testing codes below:
>
>REPLACE DATA2 WITH STRTRAN (data2,"D","E")
>
>The picture becomes fuzzy ( OK)
>
>REPLACE DATA2 WITH STRTRAN (data2,"E","D")
>
>Then, picture became yet more fuzzy.
>
>Why picture does not go back to normal ?
>
>I already tried CHRTRAN

If there are 'E's in the string already then you're going to end up converting a lot of the original 'E's to a 'D' so you don't get what you started with:

ABCDE
D => E
ABCEE
E => D
ABCDD

What are you trying to achieve?