Hello, I wanted to ask whether it is possible to compress/downsize frames saved by mywin.getMovieFrame(), so that I can save large number of frames (2000) into image stack eg tiff. I am getting memory error while trying to do so. Thanks,

If you want to compress an image file, .TIFF probably isn’t the way to go :wink: But regardless, you might be confusing disk space with memory here. The images when held in memory will be uncompressed, at 3-4 bytes per pixel. If you are running out of memory, that will be the issue, not what size t…

Hello, Thanks for a quick reply. I do not want to compress the image (sorry for confusion). I just want to save many frames but getting memory error. I think I just can create smaller window to save more frames.

Then like I said, you should try to call win..saveMovieFrames() periodically so that not so many frames build up in memory. Don’t make the window smaller: performance is much better when the window is fullscreen.

Hello, Yes, it works if I save images periodically. Thanks,

Hello, I’m absolutely new to psychopy, and wanted to save multiple frames of a dynamic grating I’m generating with the code below. However, all I’ve managed to get is to save one frame either in .png or in .mp4. The thing is that I understand that I have to save images periodically, but don’t know …

[image] Please surround python code with backticks Other When you include python code on this forum please put triple “backticks” like this ``` on the line before and the line after your code. If you’ve done it correctly then your code will appear in a grey box with corre…

Thank you. I’ve edited my post to include the backticks.

Put: win.getMovieFrame() immediately after your win.flip() line. i.e. you are wanting to store each newly-drawn lot of window content. That stored set of frames can then later be saved with a single command: win.saveMovieFrames('your_file_name.png') That will automatically generate a set of num…

Thank you for your response. I did what you suggested. However, there is only the first frame (one .png) that is saved. I’m not able to generate multiple images. Thank you so much for the help!

For anyone who finds this thread in the future … I was using a GratingStim object to capture a screenshot of the grating, transform it, and write it to a movie file using OpenCV that I can later playback with the MovieStim3 class. I was getting a memory leak when trying to generate movies more than…

Save large number of frames to tiff image stack

Coding

Michael May 12, 2018, 6:30am 7

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Save large number of frames to tiff image stack

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