How to transparent jpeg in excel?

There is jpeg inserted in excel and made transparent by VBA.

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How to make white rectangle in jpeg to transparent so that wording
under the jpeg can be shown (Pls see attached excel)?

As the original image is from others and hence cannot be changed.

If the % of Brightness or Contrast is adjusted (only 1%) manually, the
white rectangle will be transparent and it is what I want.

How to adjust the % of Brightness or Contrast by VBA?

Thanks Andy Pope that it works for 1 jpeg.

How to modify the VBA so that it can apply to all jpegs inserted in excel?

Thanks Andy Pope that it works.

As you know that the original image has light orange block,
how to revise the VBA so that the light orange do not turn white.
(i.e. light orange and wording can shown at the same time in excel.)

Hi Andy Pope,

The 2 codes have already been included in VBA.

Please advise with full VBA how to show
orange box and wording at the same place in excel.

Hi Andy Pope,

Your VBA can show orange box but cannot show wording under the box.

I mean how to show wording with orange box.

Thanks Andy Pope for help with patience.