The program Basware Message needs to send an image in black and white of your attachment.
The reasons behind it are that we are delivering a high volume of data to your recipients every day. This is done in order to keep the amount of data as low as possible.
The system itself decides whether a color point on the image should be converted to black or white.
If your attachments contain the color gray, this process becomes difficult (the decision if it's either black or white) and it can make the image illegible.
In order to ensure that all your attachments are correctly converted and delivered, always scan your images in correct the correct format: