Here we go again ;-)

Epson 1250 (using plustek backend) works only in color mode, scan-size is TPU (not Flatbed), Text fails completly.
works in Xsane (using gray and color, lineart scans in TPU size)

BTW. this scanner is crap (needs a long time to start, I've thought several times it is defunct) and it took me some time to get it working (by editing plustek.conf)

Output of 'scanimage -h'

Options specific to device `plustek:libusb:003:003':
  Scan Mode:
    --mode Lineart|Gray|Color [Color]
        Selects the scan mode (e.g., lineart, monochrome, or color).
    --depth 8|14bit [8]
        Number of bits per sample, typical values are 1 for "line-art" and 8
        for multibit scans.
    --source Normal|Transparency|Negative [Normal]
        Selects the scan source (such as a document-feeder).
    --resolution 50..2400dpi [50]
        Sets the resolution of the scanned image.
    --preview[=(yes|no)] [no]
        Request a preview-quality scan.
  Geometry:
    -l 0..215mm [0]
        Top-left x position of scan area.
    -t 0..297mm [0]
        Top-left y position of scan area.
    -x 0..215mm [103]
        Width of scan-area.
    -y 0..297mm [76.21]
        Height of scan-area.
  Enhancement:
    --brightness -100..100% (in steps of 1) [0]
        Controls the brightness of the acquired image.
    --contrast -100..100% (in steps of 1) [0]
        Controls the contrast of the acquired image.
    --custom-gamma[=(yes|no)] [no]
        Determines whether a builtin or a custom gamma-table should be used.
    --gamma-table 0..255,... [inactive]
        Gamma-correction table.  In color mode this option equally affects the
        red, green, and blue channels simultaneously (i.e., it is an intensity
        gamma table).
    --red-gamma-table 0..255,... [inactive]
        Gamma-correction table for the red band.
    --green-gamma-table 0..255,... [inactive]
        Gamma-correction table for the green band.
    --blue-gamma-table 0..255,... [inactive]
        Gamma-correction table for the blue band.
  Device-Settings:
    --lamp-switch[=(yes|no)] [no]
        Manually switching the lamp(s).
    --lampoff-time 0..999 (in steps of 1) [0]
        Lampoff-time in seconds.
    --lamp-off-at-exit[=(yes|no)] [no]
        Turn off lamp when program exits
    --warmup-time -1..999 (in steps of 1) [30]
        Warmup-time in seconds.
    --lamp-off-during-dcal[=(yes|no)] [inactive]
        Always switches lamp off when doing dark calibration.
    --calibration-cache[=(yes|no)] [no]
        Enables or disables calibration data cache.
    --speedup-switch[=(yes|no)] [yes]
        Enables or disables speeding up sensor movement.
    --calibrate [inactive]
        Performs calibration
  Analog frontend:
    --red-gain -1..63 (in steps of 1) [-1]
        Red gain value of the AFE
    --green-gain -1..63 (in steps of 1) [-1]
        Green gain value of the AFE
    --blue-gain -1..63 (in steps of 1) [-1]
        Blue gain value of the AFE
    --red-offset -1..63 (in steps of 1) [-1]
        Red offset value of the AFE
    --green-offset -1..63 (in steps of 1) [-1]
        Green offset value of the AFE
    --blue-offset -1..63 (in steps of 1) [-1]
        Blue offset value of the AFE
    --redlamp-off -1..16363 (in steps of 1) [inactive]
        Defines red lamp off parameter
    --greenlamp-off -1..16363 (in steps of 1) [inactive]
        Defines green lamp off parameter
    --bluelamp-off -1..16363 (in steps of 1) [inactive]
        Defines blue lamp off parameter
  Buttons:
    --button 0[=(yes|no)] [no] [hardware]
        This option reflects the status of the scanner buttons.
    --button 1[=(yes|no)] [no] [hardware]
        This option reflects the status of the scanner buttons.
    --button 2[=(yes|no)] [no] [hardware]
        This option reflects the status of the scanner buttons.
    --button 3[=(yes|no)] [no] [hardware]
        This option reflects the status of the scanner buttons.
    --button 4[=(yes|no)] [inactive]
        This option reflects the status of the scanner buttons.