Can you give me proper word?

00The following is from a Korean scholarastic aptitude test.02p

00Would you try this?02p

00The question is to choose the number of word which is not proper.02p

001. 01span00다음 그림을 바탕으로 한 글의 흐름으로 보아, 밑줄 친 02span01span00단어의 쓰임이 적절하지 05605000않은 것은? [3점]02span02p

01span00If you connect a primitive digital camera to your PC and aim it at a happy face, your computer might perceive the image as it appears on the right-hand side of the given drawing. The digitized image of the face is 02span01span00①02span01span05701u05102u00rough00 because the computer thinks in terms of ones and zeros and makes 02span01span00all-or-nothing approximations. This will, in some cases, 02span01span00②02span01span05805201u00enhance02u00 subtle information about light versus dark differences, hence the 02span01span00③02span01span05901u05302u00lack00 of detail in the eyes and mouth, and in other cases 02span01span00④02span01span051005401u00exaggerate 02u00such differences, as shown in the edges of what should be a 02span01span00⑤02span01span051105501u00smooth02u00, gradually curving face.02span02p

00 02p

00Thanks for reading.02p

00The answer is #2 enhance.02p

00What I want to know is if #2 is not proper, what word is possible?02p

00Thanks.02p