CREATE TABLE table_34257 ("Abbr." TEXT, "Name" TEXT, "Picture Coding Types" TEXT, "Chroma Format" TEXT, "Aspect Ratios" TEXT, "Scalable modes" TEXT, "Intra DC Precision" TEXT)

Name the Intra DC Precision that has the Name main profile?
SELECT "Intra DC Precision" FROM table_34257 WHERE "Name" = 'main profile'
SELECT "Intra DC Precision" FROM "table_34257" WHERE "Name" = 'main profile'