Recently, my camera broke down and I had to use my laptop's low-end inbuilt camera to take photos (I haven't had a smartphone yet, maybe I will buy one as soon as possible for the convenience of taking photos). Even worse, the image format used by ECap is BMP, which is extremely big in size. So I tried to convert it to PNG format with PNGGauntlet, but found that it would take dozens of hours at least to convert 356 BMP format of images to PNG format. This is really a bit joke!