Masking images (extract image) and make background white - New 3

Hi I have 24 images as the example below and all needs to be masked and put white background. All images were made in front of white background. Masking images (extract image) and make background white. Sometimes there is a white bike stand to hold bike straight at rear wheel. This needs to be masked as well. The yellow layer should be removed from all images and the original color taken from example below. Example: [login to view URL] Should be processed and looking as a result similar to. The yellow layer should be removed. [login to view URL] All images which needs to be processed: [login to view URL] Thanks BIagio