Raster contrast stretching for custom colorranges

Hi,

Is there a way to use the PROCESSING "SCALE=AUTO" directive to get
extent-based contrast stretching with custom colorranges? When I
test my mapfile (relevant layer part below) with the Openlayers
viewer it gets the desired color ramps but does not do contrast
stretching for the current extent. If I take the CLASS'es out the
greyscale output is contrast stretched according to current
extent. I have tried taking out the EXPRESSIONS and/or the
DATARANGES but then it only takes the first COLORRANGE and does
not stretch it.

Thanks,

Theo

# raster layer

LAYER

NAME "mapservtest"

TYPE RASTER

PROCESSING "SCALE=AUTO"

STATUS ON

DEBUG ON

PROJECTION

"init=epsg:3857"

END

METADATA

#WMS stuff here

END

TILEITEM "location" #location is a column in postgis table with
varchar of the filepath to each image

TILEINDEX "index"

FILTER (`[datetime]` = `2015-01-01T00:00:00Z`)

OFFSITE 0 0 0

CLASS

EXPRESSION ([pixel] >= 25 AND [pixel] < 30)

STYLE

COLORRANGE "#00ff00" "#0000ff"

DATARANGE 25 30

END # STYLE

END # CLASS

CLASS

EXPRESSION ([pixel] < 25)

STYLE

COLORRANGE "#ff0000" "#00ff00"

DATARANGE 20 25

END # STYLE

END # CLASS

END

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