problems with converting tif to jpg or png

[ManuelCarok]

This is the tiff image:

This is the one obtained by the conversions:

The person generates tif and pdf, the same thing happened to me with the pdf but I solved it with this code but I couldn't replicate it for the tif

Bitmap bitmap = Bitmap.createBitmap(widthBit, heightBit, Bitmap.Config.ARGB_8888); Canvas canvas = new Canvas(bitmap); canvas.drawColor(Color.WHITE);

I hope you can help me please