Consider adding ImgSumOperator as aggregation method

[imagejan]

When aggregating images with the GroupBy node, it would be useful to also have a "Sum Image" option in addition to Min/Mean/Max Image.

How about adding org.knime.knip.base.data.aggregation.ImgSumOperator modeled after the other aggregation operators? (As for the other aggregation methods, the caller should be responsible for using the correct desired type.)

[imagejan]

Just stumbled upon this one again. It would be really nice to have a SUM projection available.

Currently, we have in the Projector:

• MAX_INTENSITY
• MEDIAN_INTENSITY
• AVG_INTENSITY
• MIN_INTENSITY
• STD_DEVIATION

... and as aggregation functions:

• Max Image
• Mean Image
• Min Image

I'd suggest to make these two lists consistent, i.e. also provide MEDIAN and STD as aggregation functions in GroupBy, and add SUM_INTENSITY/Sum Image to both.

NB: of course you can work around the missing sum by using the average and multiplying by the count of input images.