Thank you all for your help.
I tried bmp-header-remover did not work.
after using this program I have 767 946 bytes
I did Notepad ++ and here are the effects i have exactly 768000 bytes ,mirror reflection.

Spoiler: screenshot
IMG 20191029 042950

Spoiler: screenshot
IMG 20191029 204426


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Edit:

done, in gimp I made a mirror image and saved it. Thank you so much for help.
Spoiler: screenshot
IMG 20191030 052442