Question Calculating coordinates.

[Vanlla1]

Creating a mod that changes the texture of Spook Fish. Already unpacked the content, and in the file springobject.png in paint, selecting the area where the spook fish, paint gave me that the coordinates 384x624. I got an error. Having downloaded the mod "[CP] DSHi Fish Retexture". Shows that in the same springobject.png this area 112x528! And it works. How does it calculate the coordinates?

 

[magnolia_blossom]

The size of the whole springobjects.png is correct, I checked and it is 384x624. Each object is 16x16 pixels except for the big tree stumps and big rocks which are 32x32. What error did you get exacly? Maybe there is something wrong in your content.json?