presentation of movies in full screen

[Soizic Argaud]

Hello,

Actually yes, it's helping. Thank you !
Now I have to choose what method i'll use by doing a compromise between the
size of the presentation of my movies and their quality (and directly
working on the film files before import them to E-Prime)

Best,
Soizic

2013/3/20 Cognitology <mspape at cognitology.eu>

> Hi,****
>
> The reason is pretty similar to the common problem in resizing: there’s
> only so many pixels. Imagine you have 5x5 pixels and want to draw an X:***
> *
>
> 10001****
>
> 01010****
>
> 00100****
>
> 01010****
>
> 10001****
>
> Would be more or less it (imagine 1 being a different colour from 0). Now,
> resizing it by a factor of two shouldn’t be too hard:****
>
> 1100000011****
>
> 1100000011****
>
> 0011001100****
>
> 0011001100****
>
> 0000110000****
>
> 0000110000****
>
> 0011001100****
>
> 0011001100****
>
> 1100000011****
>
> 1100000011****
>
> ** **
>
> There, the pixels are just really big now. So, you might as well have used
> twice as low a resolution – should be better, performance-wise.****
>
> In any case, imagine you wanted to resize by a factor of 1.4 (7x7 pixels)
> instead of 2. Without any type of anti-aliasing going on, you could get
> something like****
>
> 1000001****
>
> 0110110****
>
> 0110110****
>
> 0001000****
>
> 0110110****
>
> 0110110****
>
> 1000001****
>
> (here, I arbitrarily decided to double pixels 2 and 4, because I’m not
> sure how the rounding is handled).****
>
> Which rather distorts the beautiful X. Anti-aliasing could diminish the
> effect of such distortions by using a type of blurring filter, but as far
> as I know, E-Prime doesn’t do this by default. If you want to see the
> difference in effect, try copying a smallish image to MSPaint (I did print
> screen, start>run>mspaint, copied a screenshot to mspaint, moved everything
> out of sight, copied the start logo), then scale everything up by some sort
> of factor. Doesn’t look so good… Notice what happens if you scale something
> up by a factor, copy the effect you have, then scale it down to previous
> size: it looks worse than it did. The results of such a test are attached
> (hopefully it gets through, one never knows with groups):****
>
> Upper left: start button, original.****
>
> Lower left: start button, resized x 2, maintained aspect ratio, resized
> back (x 0.5). Looks as good as original.****
>
> Upper right: start button resized x 1.5, maintained aspect ratio, resized
> back (x ca. 0.67), notice distortion is visible in horizontal line the
> windows flag. Upper left (red bit) has become a straight line, the upper
> right (green bit) became pixilated. ****
>
> Lower right: start button resized a few times, didn’t maintain aspect
> ratio. It looks bad.****
>
> ** **
>
> So, even if you maintain aspect ratio throughout, artifacts are pretty
> inevitable and at best you’re just displaying images at a lower resolution.
> This makes a certain sense, of course, as the type of enlarging that
> actually adds details (CSI style, or so I’m told) hasn’t been invented yet.
> ****
>
> ** **
>
> Of course, everything here counts for video images as well as static
> images, except for the fact that movement and such hides quite a lot. ****
>
> Hope that helps!****
>
> Best,****
>
> Michiel****
>
> ** **
>
> ** **
>
> ** **
>
> *From:* e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] *On
> Behalf Of *Soizic Argaud
> *Sent:* 19. March 2013 20:14
> *To:* e-prime at googlegroups.com
> *Subject:* Re: presentation of movies in full screen****
>
> ** **
>
> Hi, ****
>
> ** **
>
> Thank you for your answer. I tried the short one but it didn't work. So I
> took your advice (better answer) and I resized my stimuli "out of" E-Prime.
> Doing this, it's ok. But I still don't understand why I can't modify easily
> the size of my film excerpts in E-Prime.****
>
> ** **
>
> Best, ****
>
> Soizic****
>
> ** **
>
> 2013/3/19 Cognitology <mspape at cognitology.eu>****
>
> Hi,****
>
> Short answer: Use a moviedisplay, set size to 100% (it’s 75% by default
> now), and turn Stretch on. You can keep the aspect ratio (e.g. Stretch mode
> LeftRight) as is or distort it into submission (stretch mode Both). ****
>
> Better answer: first, find out at which resolution your experiment is
> running. Is it widescreen? Is your monitor? What resolution are the movies?
> Then, consider re-encoding the movies to fit your resolution; though quite
> a few options are possible in E-Prime as outlined above, it makes a certain
> amount of sense to be very sure of your stimuli rather than fiddling around
> with them at runtime!****
>
> Best,****
>
> Michiel****
>
>  ****
>
>  ****
>
> *From:* e-prime at googlegroups.com [mailto:e-prime at googlegroups.com] *On
> Behalf Of *Soizic Argaud
> *Sent:* 19. March 2013 16:17
> *To:* e-prime at googlegroups.com; Soizic Argaud
> *Subject:* presentation of movies in full screen****
>
>  ****
>
> Hello everyone,****
>
>  ****
>
> I'm a new user of E-Prime and I'm currently creating a task during which I
> present different film excerpts to my participants and then, they answer
> questionnaires. ****
>
> Everything's (nearly) ok but one of the difficulties I encounter is about
> the size of the movies. I don't know how to modify it to project the movies
> in full screen.****
>
> If you can help me to fix this (first) issue, I'll be very grateful.****
>
>  ****
>
> Thank you very much for your help !****
>
>  ****
>
> Soizic****
>
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