Tips for getting the scanned version of PDF smaller and clearer

How to make a scanned version of PDF smaller and clearer

1, first use Acrobat to export the picture. Click the "Save As"-> "image"-> "PNG" on the menu bar to save it in PNG format. There is a setting button on the right side of the pop-up file selection box, which is set to open. After the general scan of the Black-and-white image is a grayscale map, we are here to save the grayscale. (in the case of a black-and-white bitmap, the file is usually small and does not need to be processed.) )

2. Use Photoshop to open the picture you need. Look at the size, if the width is less than 1400, you need to enlarge, click the "image"-> "image size", such as diagram settings, and then click OK. It's best to zoom in on the integer multiples of 150 or 200, otherwise there will be a sawtooth problem. Before zooming in, you can first adjust the percentage to preview.

3, if you want to process the picture is lighter, before adjusting the color level, you can click the "image"-> "adjust"-> "brightness/contrast", adjust brightness and contrast. (However, according to personal experience, the resulting PDF rarely needs to be adjusted like this.) )

4, click on the "image"-> "adjustment"-> "color level" to adjust the color levels.

There are two ways, one is automatic adjustment, with the white order of the color tube to click on the picture on the deepest background, black order of the color tube Click the most shallow place.

There is also a manual adjustment, first drag the white triangle to the left, so that the picture background becomes very white. Then drag the gray-scale triangle to the left until it is adjacent to the black Order. Finally drag the Black Order triangle to the right until the text is clear and the thickness is in the normal range.

5, it is possible to further the picture part of the processing, the choice of unclear areas, continue to adjust.

6, adjust before and after the difference as shown in the figure.

7, click the "image"-> "mode"-> "bitmap" saved as a bitmap. If the gray scale is large enough, the picture looks unchanged before and after the save. But the size is significantly smaller after the save. Note that the output resolution must be consistent with the input.

8, 2~5 steps, if you want to process more pictures, you can use the recording action, with the "file"-> "Automatic"-> "batch" function.

9. In the final step, use Acrobat to synthesize the processed picture as a PDF.