The total ratio representing the number of photos in the Malachi gallery is 10+17=<<10+17=27>>27
The difference in the ratios representing the number of photos Malachi took this year and last year is 17-10=<<17-10=7>>7.
This year, Malachi took 7/27*2430= <<7/27*2430=630>>630 more photos than he took last year.
#### 630