Using the "Dust and Scratches" filter for removing large damage in an old photo.
For more on matching grain see http://www.image-restore.co.uk/?s=matching+grain
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https://www.youtube.com/watch?v=4xwY3aQ7h-Y
Cira 1880 this Panorama de Constantinople pris de la Tour de Galata - Panorama of Istanbul. consisting of 10 separate images. Scanned, restored, stitched and fully recoloured. Final image over 80,000 pixels wide!
Fully researched for colours of all major buildings, flags and landmarks.
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https://www.youtube.com/watch?v=vIJM9og2GEU
We can use "content aware crop" for photo restoration to help us straighten an image without losing any photo around teh outside.
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https://www.youtube.com/watch?v=svVLLXCBK58
Beach - Ambient Image - colourised black and white image with soundscape, colour and sound added by image-restore.co.uk Neil Rhodes
Image credit shorpy.com
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https://www.youtube.com/watch?v=WcjO0LxSvQA
A very quick illustration of how colouring objects within photos, with multiple blends modes and colours, which makes a more realistic colouring process.
Not intended specifically as a tutorial its just to illustrate a live working image and colouring in use, If you do require a tutorial on colouring you should visit he blog
http://www.image-restore.co.uk/blog/colourising-or-tinting-an-old-photo-part-1/
and to see the actual photo used in the short video see the blog post
http://www.image-restore.co.uk/blog/digitally-coloured-photos-and-some-history/
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https://www.youtube.com/watch?v=iXWUtmefdxE