# Useful StitchIt functions StitchIt provides the following useful tools (partial list) * `stitchit.tools.writeSignedTiff` -- general-purpose signed TIFF writer * `mergeChannels` -- Combine two channels to create a new one by adding them, subtracting then, dividing one from the other, etc. * `stitchit.sampleSplitter` can be used to crop whole stacks to save disk space or to split up acquisitions where more than one sample was imaged. --- # Agent Instructions: Querying This Documentation If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question. Perform an HTTP GET request on the current page URL with the `ask` query parameter: ``` GET https://stitchit.mouse.vision/advanced-usage/useful-tools.md?ask= ``` The question should be specific, self-contained, and written in natural language. The response will contain a direct answer to the question and relevant excerpts and sources from the documentation. Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.