1024 grayscale

Hi everyone,
I just started doing my phd. I will train people in a visual task. Therefore, I need to draw stimuli with low contrast to stimulate the participants. As my standard 24-Bit RGB stimuli aren't satisfying, my second supervisor told me to use 1024 grayscale. As I'm a absolutel newbie to that stuff, I tried different editing software. I can only change between 8- and 16 Bit grayscale respectively 24/48 Bit RGB or CMYK. However, as soon as I try to change the contrast (i.e. by the use of the histrogram) , I only have 256 grayscale values.
Is there anyone out there who can tell me how that works? I'm already going mad
I hope I post this in the right forum. If not, please tell me where I should post it.
Thanks a lot.

Histograms are built in screen space and respect the resolution of the actual displayed pixels in relation to things like zoom and the resulting image tiles. Additionally, things like color profiles etc. figure in. I'm sure Chris Cox can explain this in endless detail, but if you explain a bit less PhD-ish and in layman's terms what you are actually trying to achieve, then I'm sure someone can give you some advise. The way I figure it, you are too much bent on the "grayscale" metaphor without recognizing that on your screen it's merely a simulation still expressed in RGB. Additionally, if you need to attain specific values, you are using the wrong tools. A Gradient Map adjustment would e.g. be much more appropriate to determine exact discrete values or you would work in one of the indexed color modes and adjust each swatch.
Mylenium

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Hello!
Help me please, tell me how i can set by default for this printer printing grayscale?
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answering this myself for those lost souls like i was a while ago:
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How to convert from Grayscale to single color channel

I hope that someone here might be able to help. I am writing an application which loads in color channels separately, to be merged by the application The images are multi-page TIFF files. The trouble that I am running into is that the application loads the images into grayscale, so when I merge the channels, they are merged as grayscale, not as the correct colors.
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Edited by: doughnuts64 on Jun 12, 2008 6:27 AM

Thanks for the response. It has been helpful in getting my problem sorted. I was not creating a new BufferedImage - I was just using the one that had been loaded in, and as such had not realised that the type was not TYPE_INT_RGB. As soon as I instantiated a new BufferedImage of the same dimensions and colour TYPE_INT_RGB as you suggested, it worked! So thanks for that.
Whilst that does work, it does slow the application incredibly as it has so much data to cycle through. Ideally, I would be able to load the image in directly as the colour channel in question, rather than loading in as grayscale. This way, the application would only require the amount of time needed to load in the images, not to process them on a pixel-by-pixel basis (typical images are made up of over 16,000,000 pixels for each colour channel, and we typically load two files in at once - both for separate colour channels, so over 32,000,000 pixels to process).
As I am loading in multi-page tiff files, I am having to use the JAI (Java Advanced Imaging) toolkit. I use the following code to load in my multi-page tiff into a BufferedImage array, where each element of the array represents one of the 'pages' in the multi-page tiff file:
SeekableStream stream = new FileSeekableStream(multiPageFile);
String[] names = ImageCodec.getDecoderNames(stream);
ImageDecoder dec = ImageCodec.createImageDecoder(names[0], stream, null);
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BufferedImage[] finalImage = new BufferedImage[numPages];
for (int i=0; i<numPages; i++) {
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...To be able to automatically convert the colour channel without having to loop on every pixel (and thus save an incredible amount of loading time) would be helpful.
Thanks.

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jyang, thank you very much for your response. I believe I found a different solution all together, by converting each 16-bit intensity value into an 8-bit intensity value via an intensity ratio (ie: divide each intensity by the maximum and multiply by 256). The attachment shows the new program.
Attachments:
mod_image.vi ‏2004 KB

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Is there a way to select every other page in a pdf and convert it to grayscale?

I'm going to ask this question in a few sub-forums, so if you think you've seen it, you might have. Someone suggested it might be done with Javascript. I know nothing about Javascript.
Where I work I use a program that can print to pdf. We use it to produce mailings, usually postcards, that are addressed.
I often end up with a 500 page document that will print on 250 sheets of cover stock, which will get cut into 1,000 postcard, all pre-addressed and sorted by zip code.
Usually, the address side is all black and the front is color. The printers we use can print a black click on the address side and a color click on the other, IF the pdf is set up that way. Otherwise, both sides will be counted as color clicks.
I know I can select pages individually in a pdf and convert them to grayscale and those pages will be counted by the printer as black clicks, which are cheaper than color clicks.
The problem is, I have not figured out how to convert all the odd numbered pages to grayscale at once. As a result, I usually end up printing the color side simplex, then putting the job back in the tray and printing the black side. Of course, that only works if only one side is personalized, sometimes both sides are.
Is there a way to select every other page in a pdf and convert it to grayscale?

The Acrobat SDK has sample code that shows how to convert the colors for one page (the first page of a document). This sample can easily be adjusted to process every other page. You can then use an Action that executes this JavaScript to process the document. Do you know how to create an Action? If so, you can use this script (as I said, adapted from the sample in the SDK) to convert all odd pages (1, 3, 5, ...):
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toGray.embed = true;
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Do you have Windows? If so, you should know Windows makes backup shadow copies.
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Shadow Explorer is free. ShadowExplorer.com - About
Gene

1024 grayscale

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