I worked on a large file that was over 3.5GB (I could only save it in the end as a Large Document Format).
But now I have to resize it to a smaller JPG file with 180 DPI and the max. filesize can be 150MB. The fabric printing company requires these settings. But when I go to "save as... " I only have the options of Tiff, PNG, Large Document Format and Photoshop Raw.
So I tried to decrease the file size by merging and flattening layers. But the file size stays the same (3.5GB).
I don't want the loose the quality of my image since it has to be printed on a large format 260 cm x 960 cm.
I have added a screenshot of my "Image size" information.