boards: arm: nucleo_f030r8: use smaller board image

[frantony]

At the moment we have different images for for Nucleo F030R8 and Nucleo F070RB boards, the images have the same pixel size but different file formats, e.g:

  NAMES="f030r8 f070rb"
  for i in $NAMES; do
    file boards/arm/nucleo_$i/doc/img/nucleo_$i.jpg;
  done


  boards/arm/nucleo_f030r8/doc/img/nucleo_f030r8.jpg: JPEG image data,
  Exif standard: [TIFF image data, little-endian, direntries=0], baseline,
  precision 8, 500x367, frames 3
  boards/arm/nucleo_f070rb/doc/img/nucleo_f070rb.jpg: JPEG image data,
  JFIF standard 1.01, aspect ratio, density 1x1, segment length 16,
  progressive, precision 8, 500x367, frames 3

The nucleo_f030r8.jpg file is larger:

  for i in $NAMES; do
    ls -1 -sh boards/arm/nucleo_$i/doc/img/nucleo_$i.jpg;
  done

  128K boards/arm/nucleo_f030r8/doc/img/nucleo_f030r8.jpg
  40K boards/arm/nucleo_f070rb/doc/img/nucleo_f070rb.jpg

Applying simultaneous black/white threshold to the images and comparing them with imagemagick tools shows that the images have no significant difference.

  for i in $NAMES; do
    convert boards/arm/nucleo_$i/doc/img/nucleo_$i.jpg \
            -threshold 80% /tmp/$i.png;
  done
  compare $(for i in $NAMES; do echo -n  "/tmp/$i.png "; done) \
            -compose src /tmp/diff.png

See also 'boards: arm: unify Nucleo-64 boards connectors image' (#15926).

[zephyrbot]

All checks are passing now.

Tip: The bot edits this comment instead of posting a new one, so you can check the comment's history to see earlier messages.