Can you try to feed this Code: -123.183900 47.032780 -123.183900 47.599720 -122.168100 47.599720 -122.168100 47.032780 manually into Code: gdaltransform -tps -i -t_srs +proj=longlat 18448_1.KAP
-123.183900 47.032780 -123.183900 47.599720 -122.168100 47.599720 -122.168100 47.032780
gdaltransform -tps -i -t_srs +proj=longlat 18448_1.KAP
E:\DeepZoom\dev\bsb2tiles>gdaltransform -tps -i -t_srs +proj=longlat 18448_1.KAP -123.183900 47.032780 264.235828047997 8192.85411369754 0 -123.183900 47.599720 264.23553921845 313.584303449666 0 -122.168100 47.599720 9864.84455602684 313.584331807953 0 -122.168100 47.032780 9864.84455306079 8192.854118532 0