How to convert a colour negative to a colour positive

I have photographed some colour negatives in RAW. I would appreciate an outline of a process as to how to convert these to positives using Lightroom v5. I have tried and failed!
Hope some one can assist - Tony (New Zealand)

Seriously? Why bother writing a reply and not just telling him how to do it? This is another form of “It depends.”
Here's how to do it:
• Go to the Tone Curve and make sure that the curve is flat (linear).
• Drag the bottom left point of the curve to the top left. (Hold down the Shift key to make dragging easier.)
• Drag the top right point of the curve to the bottom right.
Done.
Side effect: After doing this, adjustments such as Exposure will have the opposite effect of what you expect.

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Some examples are in this thread:
Re: Scanned color negative Image
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(sorry, the image will not upload)
But google for more, as Frank Caggiano described.
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Léonie

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Greetings,
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How do I change colour negative to positive?

How do I change colour negative to positive?

Using the application Final Cut Express?
Are you speaking of a film negative for a photograph?
You can edit the image to the timeline, then go Effects Tab > Video Filters > Channel > Invert and apply the Invert effect to the clip on the timeline.
Note that film negatives do not render color correctly when inverted. When they were printed, color correction "packs" were applied that were emulsion specific to balance the latent color skew present in the negative image.
So you will also need to then add the effect Video Filters > Color Correction > Color Corrector and make further adjustments.
MtD

How do I convert my colour photo into greyscale?

Hi
I have to convert my colour photo into greyscale for my MSc; can any one help? Its driving me mad....
I am using Iphoto 11 but in effects there is only the option for black and white not grey scale.

Export the image from iPhoto (File -> Export) and use another app to convert to greyscale. Check out Graphic Converter
http://www.lemkesoft.de/en/image-editing-slideshow-browser-batch-conversion-meta data-and-more-on-your-mac/

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.
I use the following on each color channel to load them in:
public static BufferedImage[] loadTiff(File multiPageFile, int colour) {
    BufferedImage[] img = null;
    ArrayList<BufferedImage> tmp = new ArrayList<BufferedImage>();
    try {
        SeekableStream stream = new FileSeekableStream(multiPageFile);
        String[] names = ImageCodec.getDecoderNames(stream);
        ImageDecoder dec = ImageCodec.createImageDecoder(names[0], stream, null);
        int numPages = dec.getNumPages();
        for (int i=0; i<numPages; i++) {
         try {
                RenderedImage im = dec.decodeAsRenderedImage(i);
                BufferedImage bi = PlanarImage.wrapRenderedImage(im).getAsBufferedImage();
          //In case not all pages are valid images, we use ArrayList as it is dynamic
          tmp.add(bi);
            }catch (RuntimeException re) {
          //Once the exception is caught, we can decode the layer here for whatever means.
    }catch (FileNotFoundException fnfe) {
        System.err.println("File not found.");
        fnfe.printStackTrace();
    }catch (Exception e) {
        System.err.println("General Exception caught");
        e.printStackTrace();
    //Convert to an array to be returned.
    img = new BufferedImage[tmp.size()];
    for (int i=0; i<img.length; i++) {
        img[i] = tmp.get(i);
    return img;
}So a BufferedImage array is returned (one element in the array for each page in the multi-page file). Before I return the BufferedImage array, though, it would be good to convert it to the correct color. I know which channel is currently being loaded. Does anyone have any tips on how to shift from a grayscale intensity to a single color intensity? I have tried a number of things regarding byte shifting, but I am really none the wiser.
I have tried, for example, reading the int color value:
int color = bi.getRGB(w,h);The trouble is that this number is not in the region 0..255, so I don't know how I can use it. If I shift the number:
color = color>>16I get a number smaller than 255 (although it seems to be negative), but I don't know whether I can use this value for a single color channel, i.e. if the current color is red, saying:
Color redC = new Color(color, 0, 0);
bi.setRGB(w,h,redC); //Slow and inefficient. There must be a better way.When I try doing that, I end up with nothing drawn or visible.
Does anyone have any ideas? Thanks in advance.
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);
int numPages = dec.getNumPages();
BufferedImage[] finalImage = new BufferedImage[numPages];
for (int i=0; i<numPages; i++) {
     RenderedImage im = dec.decodeAsRenderedImage(i);
     finalImage[i] = PlanarImage.wrapRenderedImage(im).getAsBufferedImage();
     //...colour changing code currently here - loops through finalImage array, and on every pixel of every layer
...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.

How do I fix colour picker to work across different colour-managed monitors?

Hey everyone!
I'm assuming this problem I'm having stems from having colour-calibrated monitors, but let me know if I'm wrong!
To preface, this is the setup I have:
Windows 7
3 monitors as follows, all have individual colour profiles calibrated using the Spyder 3
Cintiq 12WX
Dell U2410
Dell 2409WFP
Photoshop CS6 - Proofed with Monitor RGB, and tested with colour-managed and non-colour-managed documents
I usually do most of my work on the Cintiq 12WX, but pull the photoshop window to my main monitor to do large previews and some corrections. I noticed that the colour picker wouldn't pick colours consistently depending on the monitor the Photoshop window is on.
Here are some video examples:
This is how the colour picker works on my Dell U2410: http://screencast.com/t/lVevxk5Ihk
This is how it works on my Cintiq 12WX: http://screencast.com/t/tdREx4Xyhw9
Main Question
I know the Cintiq's video capture makes the picture look more saturated than the Dell's, but it actually looks fine physically, which is okay. But notice how the Cintiq's colour picker doesn't pick a matching colour. It was actually happening the opposite way for a while (Dell was off, Cintiq was fine), but it magically swapped while I was trying to figure out what was going on. Anyone know what's going on, and how I might fix it?
Thanks for *any* help!
Semi-related Question regarding Colour Management
Colour management has always been the elephant-in-the-room for me when I first tried to calibrate my monitors with a Spyder colourimeter years ago. My monitors looked great, but Photoshop's colours became unpredictable and I decided to abandon the idea of calibrating my monitors for years until recently. I decided to give it another chance and follow some tutorials and articles in an attempt to keep my colours consistent across Photoshop and web browsers, at least. I've been proofing against monitor colour and exporting for web without an attached profile to keep pictures looking good on web browsers. However, pictures exported as such will look horrible when uploaded to Facebook. Uploading pictures with an attached colour profile makes it look good on Facebook. This has forced me to export 2 versions of a picture, one with an attached colour profile and one without, each time I want to share it across different platform. Is there no way to fix this issue?
Pictures viewed in Windows Photo Viewer are also off-colour, but I think that's because it's not colour managed... but that's a lesser concern.

I think I've figured out the colour management stuff in the secondary question, but the weird eyedropper issue is still happening. Could just be a quirk from working on things across multiple monitors, but I'm hoping someone might know if this is a bug/artifact.
Going to lay out what I inferred from my experiments regarding colour management in case other noobs like me run into the same frustrations as I did. Feel free to correct me if I'm wrong - the following are all based on observation.
General Explanation
A major source of my problems stem from my erroneous assumption that all browsers will use sRGB when rendering images. Apparently, most popular browsers today are colour-managed, and will use an image's embedded colour profile if it exists, and the monitor's colour profile if it doesn't. This was all well and good before I calibrated my monitors, because the profile attached to them by default were either sRGB or a monitor default that's close to it. While you can never guarantee consistency on other people's monitors, you can catch most cases by embedding a colour profile - even if it is sRGB. This forces colour-managed browsers to use sRGB to render your image, while non-colour-managed browsers will simply default to sRGB. sRGB seems to be the profile used by Windows Photo Viewer too, so images saved in other wider gamut colour spaces will look relatively drab when viewed in WPV versus a colour-managed browser.
Another key to figuring all this out was understanding how Profile Assignment and Conversion work, and the somewhat-related soft-proofing feature. Under Edit, you are given the option to either assign a colour profile to the image, or convert the image to another colour profile. Converting an image to a colour profile will replace the colour profile and perform colour compensations so that the image will look as physically close to the original as possible. Assigning a profile only replaces the colour profile but performs no compensations. The latter is simulated when soft-proofing (View > Proof Colors or ctrl/cmd-Y). I had followed bad advice and made the mistake of setting up my proofing to Monitor Color because this made images edited in Photoshop look identical when the same image is viewed in the browser, which was rendering my images with the Monitor's colour profile, which in turn stemmed from yet another bad advice I got against embedding profiles . This should formally answer Lundberg's bewilderment over my mention of soft-proofing against Monitor Colour.
Conclusion and Typical Workflow (aka TL;DR)
To begin, these are the settings I use:
Color Settings: I leave it default at North American General Purpose 2, but probably switch from sRGB to AdobeRGB or ProPhoto RGB so I can play in a wider gamut.
Proof Setup: I don't really care about this anymore because I do not soft-proof (ctrl/cmd-Y) in this new workflow.
Let's assume that I have a bunch of photographs I want to post online. RAWs usually come down in the AdobeRGB colour space - a nice, wide gamut that I'll keep while editing. Once I've made my edits, I save the source PSD to prep for export for web.
To export to web, I first Convert to the sRGB profile by going to Edit > Convert to Profile. I select sRGB as the destination space, and change the Intent to either Perceptual or Relative Colorimetric, depending on what looks best to me. This will convert the image to the sRGB colour space while trying to keep the colours as close to the original as possible, although some shift may occur to compensate for the narrower gamut. Next, go to Save for Web. The settings you'll use:
Embed Color Profile CHECKED
Convert to sRGB UNCHECKED (really doesn't matter since you're already in the sRGB colour space)
and Preview set to Internet Standard RGB (this is of no consequence - but it will give a preview of what the image will look like in the sRGB space)
That's it! While there might be a slight shift in colour when you converted from AdobeRGB to sRGB, everything from then on should stay consistent from Photoshop to the browser
Edit: Of course, if you'd like people to view your photos in glorious wide gamut in their colour-managed browsers, you can skip the conversion to sRGB and keep them in AdobeRGB. When Saving for Web, simply remember to Embed the Color Profile, DO NOT convert to sRGB, and set Preview to "Use Document Profile" to see what the image would look like when drawn with the embedded color profile

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Pantone 2196 C how to convert to CMYK it is not in CS6

Pantone 2196 C is one of the 336 new Pantone solid colours that were introduced in 2012.
http://forums.adobe.com/message/5361284
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Hello,
as the title suggests I need to combine a Basler camera with labview ( version 8.6 or higher) and convert the colours of the image in temperature signals. I have some thermocouples which measure temperatures of a black paper which change colour with the temperature, so I would like either to:
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int i= (int)System.currentTimeMillis();
System.out.println(i);
The result is nagative
such as;
-585450145
How to convert nagative integer to positive integer.

Isn't it enough to multiply the integer with -1?!?
Or did � understand something wrong?
slaps head
Yes, but an int is only 32 bits wide; a long is 64
bits wide.
The fact that the int is negative isn't "real" - it's
because they cast it to the wrong type. System time
in millis is returned as a long, and that's what it
should be cast to.
%Doh, I'll get me coat.

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I have a simple photograph of clouds on a blue sky
I would like to recolour this photograph, so that I can have a red, orange, green, yellow etc version of the same image
I am completely stuck - I've never used layers before so perhaps this is where I'm going wrong?
What I basically want to do is to apply a tint - I think.
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Thank you.

Here's another way:
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Enhance > Adjust Color > Remove Color
or
Enhance > Adjust Color > Hue/Saturation,
and move the Saturation slider all the way left.
2. Add a blank layer above the picture layer.
3. Set the Foreground color to your new color.
4. Alt-Backspace to fill the new layer with the Foreground color.
5. Change the layer's blending mode to Color.
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In this example I set the Foreground to blue and Opacity to 30%.
http://www.pixentral.com/show.php?picture=11k0iWXbZQtl3ycjGtFKYwBuFUwlp1
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How to convert class file

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This is my environment setting:
@echo off
set JC_HOME=C:\JavaCard\java_card_kit-2_2
set JAVA_HOME=C:\j2sdk14103
set PATH=.;%JC_HOME%\bin;%PATH%
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I have compiled this file to a class file.
This is where is I saved my file
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May I know what is this for?
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com.sun.javacard.samples.HelloWorld.HelloWorld
com.sun.javacard.samples.HelloWorld
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error: file scr\com\sun\javacard\saples\Wallet\Wallet.opt could not be found
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sion
OR
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-exportpath <list of directories>
list the root directories where the Converter
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*********************************************************May I know What is the correct command line to convert the class file and what must I do to before converting the class file?
I saw some article saying we must use JDK1.3, is it a must?
Your solution is highly appreciated.
Thank you!

Hi Ricardo,
I saved the file below as WalletApp.opt in the directory of scr\com\sun\javacard\samples\WalletApp
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WalletApp 0xa0:0x0:0x0:0x0:0x62:0x3:0x1:0xc:0x2 1.0
But I still have the problem below:
C:\JavaCard\java_card_kit-2_2\samples>converter -config scr\com\sun\javacard\sam
ples\WalletApp\WalletApp.opt
error: file scr\com\sun\javacard\samples\WalletApp\WalletApp.opt could not be fo
und
Usage: converter <options> package_name package_aid major_version.minor_ver
sion
OR
converter -config <filename>
May I know What's wrong with my command or file?
Where can I download JDK because what I can find is J2SDK.
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To whom it may concern,
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I developed the web app and tried to create a provider and a channel for it, but the Portal server did not recognize the WEB-INF folder and give me errors saying that it couldn't locate the class files.
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To summarize my questions,
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Thank you

How to convert a colour negative to a colour positive

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