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Microsoft PowerPoint: Lock Objects in Slide

Goal: I wanted to lock the Footnotes (date, page number, etc) that I don’t usually make edits to.

Problem: PowerPoint does not have a feature to lock any object. Indirectly, you can lock a picture by putting it into Slide Master. But those text boxes even in Slide Master are still selectable and movable in Normal view.

Microsoft product managers and community volunteers have once again failed to realize what users want is what they should do. The link points to an old thread that’s asking for this feature.

Solution: In the Slide Master view, place a rectangle shape above the text box, and fully cover it with the shape. Then, remove its Outline by changing it to No Outline. The color fill is the tricky part, and you will have to set the color to any color with 100% transparency, instead of simply No Fill.



Microsoft PowerPoint: Convert and Replace Image to PNG Format

The following procedures are written according to and tested under PowerPoint 2010 (14.0.7182.5000 64-bit, Office Professional Plus)


Image could take a substantial storage space in a PPT file. We can replace EMF format images with compressed PNG or any other desired format.

Solution 1:

This could easily be achieved by the following steps:

  1. Right click on picture, select ‘Save as Picture’. In the dialog box, select desired picture format and save the picture.
  2. Import the picture by either copy-and-paste or going to ‘Insert’ tab -> ‘Images’ group -> ‘Picture’.
  3. Remove the old one and place the new one to the right location.

Solution 2:

When the amount of task gets large, it is better to use macro.

  1. Add macro functionality to the current presentation.
    1. Go to ‘Customize Ribbon’ (Right click on Ribbon, select ‘Customize the Ribbon’).
    2. On the right side of the window, under ‘Customize the Ribbon’, locate and check the ‘Developer’ tab.
    3. Click ‘OK’.
    4. In main window, switch to ‘Developer’ tab. Click ‘Macros’ in the ‘Code’ group.
    5. In the ‘Macro’ dialog box, fill the Macro name as ‘ConvertShapeToPNG’ and click the ‘Create’ button.
    6. In the VBA window, fill in the newly added macro with the code attached at the end of this post.
    7. Close the VBA window, and go back to the main window of slides.
  2. (Optional) Save the slides including the macro. Due to security limitations, the slides has to be saved into a macro-enabled file.
    1. Click ‘Save’, and a prompt saying that you have to save the file as a macro-enabled file type.
    2. Click ‘No’ to refuse to save it as  a macro-free presentation.
    3. Follow the aforementioned instruction to save the file.
    4. (After editing) When done, save the file as macro-free presentation by changing back the file format in ‘Save as’ dialog. Answer ‘Yes’ to the question and the macro is automatically removed.
  3. Add a button in the Ribbon for the macro.
    1. Go to ‘Customize Ribbon’ (Right click on Ribbon, select ‘Customize the Ribbon’).
    2. On the right side of the window, in ‘Choose commands from’, select ‘Macros’. The macro we just added should show up below.
    3. Under ‘Customize the Ribbon’, click ‘New Tab’ and rename the new tab and group as desired.
    4. Drag the macro from the left to the new group.
    5. Click ‘OK’ and return to the main window.
  4. In the slide, select a single picture that you wish to convert. Click the Ribbon button for the macro, and see the change.



Stack Exchange: How to convert multiple embedded PNGs to JPEGs in Powerpoint file?

Stack Overflow: Convert internal images in powerpoint to one format


(Click “阅读更多” below to get the code)

阅读更多 »





How Nvidia breaks Chrome Incognito | charliehorse55


Summary: Video card makers don’t like erasing G-RAM buffers before handing them over to other applications, because they think that would significantly slow down the performance. Application developers don’t like erasing the buffers before returning them back to GPU, since they think it would not be their job. After all, users have to do their own cleaning job.
Well done, another industry standard.


Chrome OS: Entirely disable mouse accelaration


Chrome OS is light weighted. That means users have few options to customize it into forms suitable for themselves.

One of the missing features is disabling mouse accelaration. Under current design, user can only adjust “mouse pointer speed” in the Settings page. No accelaration adjustment. Accelaration is meaningful for touchpads. But for external mice, it’s awkward. At least true to me.

In older versions of Chrome OS, one can find a way to disable accelaration by typing xset m 0 in the terminal console. In later updates, xset is deprecated with no successor at all.

With the latest beta channel update, it’s possible to achieve that again. But the command becomes much more complicated.

That’s the way Google makes simple life not simple.

inputcontrol –mouse_custom_point_accel=\
inputcontrol –use_mouse_custom_point_accel=1

Note: the “4” in the second line is the linear speed that you may want to change. With the last line of command, Chrome OS will pick up user definition of mouse accelaration, ignoring the “mouse speed” option in the Settings page.


Reference – Issue 359288: Find the holy grail of mouse acceleration curves


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Printing Python code in LaTeX

LaTeX does not support printing Python code with useful markup and format out of box.

This page links to the minted package, which provides a ready-for-use package for CTAN and LaTeX.

This page gives a minimal implementation (only some customization in .tex file, no packages) for marking Python code.

This is a black-and-white version. I don’t use it.


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