将底片进行初步筛选，选出影响扫描质量和扫描速度的底片（特殊底片）。包括

The negatives are preliminarily screened and the negatives (special negatives) that affect the scanning quality and scanning speed are selected. Including the difference in blackness in different areas of the same negative film, the negativeness of the negative film is too large or too small, scratched, heavily polluted negative film;

The negatives are initially screened to select negatives (special negatives) that affect the quality of the scan and the speed of the scan. Including the same negative in different areas of the blackness difference is greater, the negative black through large or too small, scratched, serious pollution of negatives;

The negative film was screened preliminarily, and the negative (special negative) which affected the scanning quality and scanning speed was selected. It includes the film with large difference in density in different areas of the same film, too large or too small film blackness, serious scratch and pollution;<br>