Use Photoshop software to adjust the size of a 300*100 picture to less than 15k. The following operations can be performed:
1. Open the "File" menu after saving the image. Click Save for Web.
2. Select the format for saving the image as "JPEG". You can adjust the size by modifying the quality of the image. The higher the quality, the larger the image will be. It can be less than 15K. Click Save when completed.
Effect: