I'm using black-and-white illustrations for a client's product images. A sample of the original artwork is attached (Envelope) and one of the updated versions that I altered in Photoshop to be blacker so they stand out better (Envelope group). Both files are 3508x2480, 795KB.
They look fine until I upload them then they look rubbish. The link takes you to one of the product pages.
Anyone have any suggestions about how I can get the web versions to look better?
Thank you!