I downloaded a explosion generator that makes an animated explosion but saves each frame as a seperate png image. I cant for the life of me find a tool that will take all the images and make an animated strip image, with the frames next to each other. I tried gimp but no luck! The Photoshop image combiner is too cumbersome. Any recommended utilites to do this?
Gimp can do this, and it is actually a piece of cake.
Open all the frames as individual images. Then on the first image select Filters|Combine|Film Strip. Add the remaining frames to the list on the right side (in the correct order).
Now click on the Advanced tab and set Image Height all the way to the right (1.000) and Image spacing all the way to the left (0.000).
Hit OK and you should have your filmstrip!
The GIMP film strip works fine but does force a background color on you, if you have images with transparent (alpha) background this might be problematic for you.
Related
How can I overlay an image onto a video without changing the video file?
I have many videos and I want to be able to open them and overlay a ruler onto them and then measure the distance an individual moved visually. All I want is to play a video and then to open up an image with some transparency and position the image over the video. This way i would be able to look at the video and see how far the individual moved.
I would like to do this without having to embed the image like a watermark, because that is computationally expensive. I would need to copy the video, embed it with the ruler and then watch the video, then delete that video file. This seems unnecessary. I would like to just watch the video and have a transparent image over it while I a watching.
Is there a program that does this all together?
Alternatively, is there a program which I can use to open an image and make it transparent and then move it over the video that is playing?
Note: I am using Windows.
It sounds form your requirements that simply overlaying a separate image layer over the video will meet your needs.
Implementing this approach will depend on the video player client you are using, but you could implement an HTML5 based solution and play the videos locally with this (or even from a URL on the web if you have them there).
There is a nice answer with a working fiddle which shows how to do this with HTML5 here: https://stackoverflow.com/a/31175193/334402
One thing to note - you have not mentioned scale in your question. If you need to measure how far the person has moved in real distance, rather than in just cm's across the video screen, then you will need to somehow work out the scale of the video. This makes things considerably harder as the video may zoom in and out during the sequence you want to measure, so you would need some reference to calculate the scale for each frame. One approach would be to use the individual as a reference, assuming they are in all the frames you are interested in.
What about using good old VLC for that?
Open VLC go to Tools→Effects and Filters→Video Effects→Overlay and select Add logo checkbox:
Then, add your transparent overlay image and play any video with VLC. The output looks like this:
I'd like to merge this ordinary png file:
with this gif animation:
(source: mytree.co.il)
I don't want to use css' position and Z-index, it messes up my images which are located in table cells.
If you are looking to make gif image, try GIMP. Here are steps to make gif image with GIMP.
http://www.wikihow.com/Create-an-Animated-GIF-Image-with-GIMP
Good Luck.
Extract the gif frames with a software like http://www.addictivetips.com/windows-tips/how-to-extract-frames-from-gif-animation-image/
Use photoshop, GIMP or any similar image editor to merge the background to the images. Tools like magic wands with a precise threshold might help in the matter
Put it all together into a new gif file
Good luck
I use Abbyy FineReader for ScanSnap to OCR a couple of scanned PDF files. The software claims it retains the original PDF images. The PDF file sizes pre-OCR and post-OCR are almost identical, which is good.
After the software is done, all PDF images appear anti-aliased in Acrobat X. Page navigation is much slower than before, and when I zoom in/out, the images first go to what looks like the pre-anti-aliasing version before quickly changing to anti-aliased images.
Left: Scanned PDF / Right: after OCR with Abbyy
I would like to get the original images without anti-aliasing back. Interestingly, when I open a single page from the anti-aliased PDF in Photoshop, there is no anti-aliasing and the image looks like the left one.
My limited PDF programming experience leads me to believe that Abbyy likely sets some kind of anti-alias flag for each image during OCR processing. How do I un-set this flag?
Any pointers to useful ideas would be much appreciated.
After the software is done, all PDF images appear anti-aliased in Acrobat X. Page navigation is much slower than before, and when I zoom in/out, the images first go to what looks like the pre-anti-aliasing version before quickly changing to anti-aliased images.
Actually in the original file 2013_11_15_22_51_31.pdf contains a JPEG image while the OCR'ed file 2013_11_15_22_51_31_OCR.pdf contains a JPEG2000 image.
Comparing them in third party viewers, it becomes clear that the image in the OCR'ed file is not inherently anti-alias'ed. Furthermore there is no evident flag in the PDF instructing PDF viewers to apply anti-aliasing to the JPEG2000 image. Thus, Adobe Reader seems to automatically render JPEG and JPEG2000 images differently, applying anti-aliasing to the latter but not to the former.
Comparing both images in detail, though, it becomes clear that these images are not identical but instead the image in the OCR'ed PDF is slightly rotated.
I assume Abbyy FineReader recognized that the original scanned image is not correctly oriented. Thus, it rotated it slightly to correct this orientation.
Thus, replacing the image in the OCR'ed version with the one from the original one is no option: Due to the rotation the OCR information would partially be somewhat off.
What you might want to try is to recode the JPEG2000 image to JPEG and replace the image in the OCR'ed version with this recoded one. This will mean some loss of quality but most likely you can get rid of the anti-aliasing this way.
Be aware, though, that the JPEG2000 image is slightly larger than the JPEG image to accomodate for the rotation.
PS: As #VadimR pointed out, there is indeed an /Interpolate true entry in the image dictionary of the OCR-ed version I missed when looking at the file. This does not seem to be the major issue slowing down the rendering.
There is /Interpolate true entry in image dictionary of OCR-ed version, and that's what causes 'anti-aliasing'. Whether that (and not JPEG2000 instead of JPEG compression) is a cause of slow-down, you check on large enough files.
To un-set this key, the best would be to turn it off while creating a file, and if that's not possible, to write and run a small program in suitable language.
But, since your file doesn't sport 'compressed objects' and offending key is in plain view inside a file, in the spirit of 'job done quickly' you can simply process your file e.g. like this:
perl -M-encoding -0777pe "s!/Interpolate true!' 'x17!ge" <in.pdf >out.pdf
)
I have a application to show some videos and images.. like a presentation.. The images have different resolution's and the videos to. I want to put the images and the videos in full screen mode but without lose quality.. The rotation of screen is fine, but the media content does not appear like they should..
Basically i want to show the images centered in vertical and horizontal without lose quality..
Suggestions?
For the video I would recommend using a MediaElement with the Stretch attribute set to 'Uniform'. 'Uniform' takes up all the space that you give the control but it ensures that the video maintains its aspect ratio. You should still have all the qaulity possible because the stretching happens on the GPU and it does a great job. You can see an example here:
http://msdn.microsoft.com/en-us/library/system.windows.controls.mediaelement.aspx
Now, if you want the video to only scale up to it's orignial size but not get blown up any larger, then just set the Stretch property to 'None'.
The Image control works the same way and also has the same Stretch property. See the Image class documentation and sample here:
http://msdn.microsoft.com/en-us/library/system.windows.controls.image(v=VS.95).aspx
Did you try the MediaElement API and the NaturalVideoHeight and NaturalVideoWidth properties?
Here is an image:
This image is a simple black-to-transparent gradient saved in full RGBA PNG.
Here is the same image, converted to indexed-alpha PNG by GIMP (Photoshop produces the same result)
As you can see, the gradient is now half-opaque, half-transparent.
Here is the same image again, only this time it was converted to indexed-alpha PNG by a PHP script I wrote:
So my question is: Why are GIMP and Photoshop unable to support partial transparency in indexed images, when the PHP script clearly shows that such an image can be created with no problems?
Is there anything "wrong" with an image whose pallette contains alpha information?
A more programming-related question: Does this transparency in the last image work in Internet Explorer 6?
I've finally found the actual answer: There is a metadata entry that allows you to define the alpha value of each colour in the colour table. Most graphics programs don't make use of this, but it does exist and can be used, in particular by GD.
Another option besides fireworks is pngquant, a command line application that will convert a rgba png into an indexed png with transparency.
I found this post which talks some more about how to use it.
IE6 and earlier in windows does not support variable transparency PNGs without annoying workarounds. An indexed PNG will only show the fully opaque parts which usually works pretty well. A drop shadow would disappear but the opaque parts of the logo or icon would continue to show.
This page has a better explanation and instructions with more png compression and quantization tools: http://calendar.perfplanet.com/2010/png-that-works/
For the record, PNG does not literally support indexed images with an alpha channel. What is really happening is that PNG allows you to add additional colors to the color table (i.e. index) with alpha values in those colors... not a complete alpha channel. FWIW...
Yeah I know what you mean. Fireworks is the only image editing program that I know of that can create and edit PNG8+Alpha without problems. I wish more paint programs would support this format cause Fireworks is expensive!
I found a way in GIMP to create or convert an image with reduced color palette and alpha channel.
The trick is to add a mask to the layer.
Full steps to reproduce:
Have your image in one layer
Add a mask to the layer. Select Transfer layer's alpha channel.
Convert to Indexed (Image -> Mode -> Indexed...)
Save as PNG
Now your image has reduced colors and reduced size, but it keeps your smooth transparency.