Merge remote-tracking branch 'upstream/main' into main-repo

.github/workflows/README.md

@@ -2,7 +2,7 @@
 
 This directory contains workflows to be used for Lessons using the {sandpaper}
 lesson infrastructure. Two of these workflows require R (`sandpaper-main.yaml`
-and `pr-recieve.yaml`) and the rest are bots to handle pull request management.
+and `pr-receive.yaml`) and the rest are bots to handle pull request management.
 
 These workflows will likely change as {sandpaper} evolves, so it is important to
 keep them up-to-date. To do this in your lesson you can do the following in your
@@ -94,9 +94,9 @@ branch called `update/workflows` and a pull request is created. Maintainers are
 encouraged to review the changes and accept the pull request if the outputs
 are okay.
 
-This update is run ~~weekly or~~ on demand.
+This update is run weekly or on demand.
 
-### 03 Maintain: Update Pacakge Cache (update-cache.yaml)
+### 03 Maintain: Update Package Cache (update-cache.yaml)
 
 For lessons that have generated content, we use {renv} to ensure that the output
 is stable. This is controlled by a single lockfile which documents the packages
@@ -140,7 +140,7 @@ Once the checks are finished, a comment is issued to the pull request, which
 will allow maintainers to determine if it is safe to run the 
 "Receive Pull Request" workflow from new contributors.
 
-### Recieve Pull Request (pr-recieve.yaml)
+### Receive Pull Request (pr-receive.yaml)
 
 **Note of caution:** This workflow runs arbitrary code by anyone who creates a
 pull request. GitHub has safeguarded the token used in this workflow to have no
@@ -171,7 +171,7 @@ The artifacts produced are used by the next workflow.
 
 ### Comment on Pull Request (pr-comment.yaml)
 
-This workflow is triggered if the `pr-recieve.yaml` workflow is successful.
+This workflow is triggered if the `pr-receive.yaml` workflow is successful.
 The steps in this workflow are:
 
 1. Test if the workflow is valid and comment the validity of the workflow to the

.github/workflows/sandpaper-version.txt

@@ -1 +1 @@
-0.11.15
+0.16.5

.zenodo.json

@@ -49,6 +49,10 @@
     {
       "name": " Ruobin Qi",
       "orcid": "0000-0001-9072-9484"
+    },
+    {
+      "name": "Marco Dalla Vecchia",
+      "orcid": "0000-0002-0192-8439"
     }
   ],
   "license": {

episodes/02-image-basics.md

@@ -32,6 +32,12 @@ as numeric abstractions, approximations of what we see with our eyes in the real
 Before we begin to learn how to process images with Python programs,
 we need to spend some time understanding how these abstractions work.
 
+:::::::::::::::::::::::::::::::::::::::::  callout
+
+Feel free to make use of the [available cheat-sheet](./files/cheatsheet.html) as a guide for the rest of the course material. View it online, share it, or print the [PDF](./files/cheatsheet.pdf)!
+
+::::::::::::::::::::::::::::::::::::::::::::::::::
+
 ## Pixels
 
 It is important to realise that images are stored as rectangular arrays

episodes/06-blurring.md

@@ -51,7 +51,7 @@ A high-pass filter will retain the smaller details in an image,
 filtering out the larger ones.
 A low-pass filter retains the larger features,
 analogous to what's left behind by a physical filter mesh.
-*High-* and \*low-\*pass, here,
+*High-* and *low*-pass, here,
 refer to high and low *spatial frequencies* in the image.
 Details associated with high spatial frequencies are small,
 a lot of these features would fit across an image.

instructors/instructor-notes.md

@@ -36,6 +36,12 @@ to share your experience with the lesson Maintainers.
 - Be aware that learners might get surprising results in the *Keeping only low intensity pixels* exercise, if `plt.imshow` is called without the `vmax` parameter.
   A detailed explanation is given in the *Plotting single channel images (cmap, vmin, vmax)* callout box.
 
+## Additional resources
+
+- A cheat-sheet with graphics illustrating some concepts in this lesson is available:
+    - [Cheat-sheet HTML for viewing in browser](../episodes/files/cheatsheet.html). 
+    - [PDF version for printing](../episodes/files/cheatsheet.pdf).
+
 
 ## Questions from Learners