reporting services - SSRS image with expression -

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i trying change "red" color in expression embedded image below code can't life of me show image.

=iif(fields!lotqty.value = fields!siallocqty.value, "lightgreen", "image1")

image

image should set in backgroundimage section not in backgroundcolor section. can set if value such display color, display lightgreen color, otherwise put nocolor or transparent. in backbroundimage put expression shows either image or nothing (depending on value).


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