Showing posts with label Print Software. Show all posts
Showing posts with label Print Software. Show all posts

Tuesday, 19 October 2010

In Design Session - Mistakes

In this session we have been given an inDesign document with 8 mistakes and we need to try and find what they are. They are not mistakes in terms of content but more in terms of production.

1.One of the first most obvious mistakes is that there is an RGB colour in the swatches. The document is a print document so it is in CMYK format. The RGB swatch should not be there.



2. Another obvious mistake is that two of the spot colours are not used in the image but are seen in the separations preview. This means that the document will require 7 plates; C, M, Y, K and 3 other pantone spot colours. It only really needs 5 printing plates so this would create unnecessary cost.




3. There is a missing link for one of the images called "tree sillhouette.ai" which means that the original image has been moved or deleted since placing it in the document. This means that it will not be able to be printed properly.



4. the image "Bird 5.psd" is in an ok file format but the resolution of the image is set to 72PPI which is fine for screen based media but should be 300PPI for print.



5. The image "Bird 3.tiff" is in RGB colour mode instead of CMYK.



6. The document has a bleed of 3mm which is a good standard bleed and it has been used on pages 2, 3 and 4 but not on the first page. That means that there could be mistakes in cutting the document after printing and can leave a white space around the page.



7. The image "Bird 1.tiff" has been scaled down to 15.8%. Only Adobe Illustrator files should be scaled up or down in InDesign because they are still vectorised. Other image files should be created at the size that they will be used in the document and then should not have their size changed at all.


8. The final error in the document is on the back page where it says 'Back Cover'. The type is in Registration colour which is used for registration marks and is actually printed on every plate. This can cause too much ink to be used on the paper and can cause it to tear or distort. 


Wednesday, 13 October 2010

InDesign Workshop

For this session in InDesign we learned about the similarities in print accessibility between adobe programs and learned some other things that InDesign can do really well. 

 Document setup is a good way to ensure no mistakes later on in the print process. One important aspect is Bleed which lets some of the design bleed over off the sides of the page to make sure that there are no white marks of paper left after cutting the finished design. The standard bleed is 3mm which is easily enough.


The document setup has a lot of other options like the columns and margins which all give the document guides to make it a bit easier to lay out and work with. The document size must always be the same size as the finished printed and cut piece of print; If the final product is business card size then the document size should be the size of the business card, not A4 size with several business cards on it. 

 The facing pages button will only be checked if the document should be for a double page spread in a magazine or book. It just makes it easier to see how the pages work together.

This is what the document will look like with the above values in each field for the document set up. In the middle is a blank rectangle which can be coloured and resized. Colouring using InDesign is really easy and can be done with the swatches tab just like Illustrator or Photoshop. 


 You can also use the stroke window to change all the setting for the stroke of the outside line of the box.
Adding colour to the fill and the stroke is just like using Illustrator or Photoshop too.



 Above you can see that I have given the stroke and the fill a different green colour. You can press the W as a shortcut key to see what the layout will look like without the guides.



The same things can be done with text. You can fill the bounding box by fill and stroke or you can change it so that the type is affected as well. 

 In the swatched tab there is a grey square and and T next to each other. These are what shows whether the colour of the bounding box or the type is being affected. To start changing the colour of the type you just press the 'T' and start changing the colour in the same way.
 This shows the type fill colour being changed to a darker blue. As you can see it doesn;t affect the bounding box colour changes.
 You can also see that the swatch options for adding and editing a new swatch are identical to those in Adobe Illustrator.
If you place a grayscale image in to InDesign then you can change the black used in the grayscale to any other spot colour. You simply hover over the image and click the grey circle that will appear in the middle. This will select the image itself and then you can use the swatches tabs to create a new spot colour and apply it directly to the elecments of teh picture that used the black colour and its tones. 

 Here I have chosen the Pantone colour Rubine red. The swatches tab is also almost exactly the same as the Illustrator and Photoshop swatches tab. In Indesign the only colours that it starts with are Registration, Paper, Key Black, Cyan, Magenta, Yellow, Red, Green and Blue. The other two green colours are the ones that I used for the Green box and its stroke.
You can also tell that the Rubine Red pantone colour is the only spot colour because of the circle inside the gray square on the right.
The CMYK coloured square next to that means that the colour can be replicated in CMYK colours although it still may not be very accurate. Pantone Spot Colour will always be accurate.

Below you can see the image with the Rubine Red spot colour applied.

You can also change the colour of the bounding box which can give you a kind of fake Duotone image. If you imagine that all the blue in the picture below is just a big block of blue put behind the pink then it makes a bit more sense.


This picture can be used to represent how you can check that there are no unwanted colours in the work.

 Under the Window menu you can go to Output and then select Separations Preview which will show each of the colours being used and can show which colour is where.
This works with a similar principle as using the channels tab in Photoshop to see each channel individually.
 This is what the separations menu looks like. You can see Cyan, Magenta, Yellow and Key Black plus the one spot colour used for the work SPOT. The image of the bird is made up of CMYK so those colours are already included.


Each of the images below show what happens when one of the separations is selected.




Below is one of the final stages of the printing which is setting up the document for print. You must always make sure that Registration marks and Crop marks are selected so that the document can be cut correctly.

You can also select to print each separation separately as shown below. This could be done for CMYK screen printing but a similar technique would be used in industry to put each colour layer of the design on to a different plate. In fact the process for exposing the picture on to a plate in Offset Lithography is quite similar to that used in screen printing.

Another interesting feature that InDesign uses is that you can choose to overprint or knockout print. By default InDesign will print in the knockout way because that is the only way to ensure that colours don't mix and that some colours can come through others.
Some colours such as yellow are not very bold so they would become lost behind darker colours such as magenta. The way that the program avoids this if the two colours overlapped would be to cut the yellow part out of the magenta part. As a whole the picture would still look the same but the colour would be able to stand out a lot better.

Below is an example of not using knockout layering. I have selected overprinting and you can see how the colours would blend. The yellow is barely visible through the O of SPOT and the K completely eradicates any colour that sits on top or below it.

Tuesday, 5 October 2010

Photoshop Colour Session

In this session we recapped a bit about interchanging between CMYK and RGB colour modes in Photoshop and a bit more detail about how to get the best out of an RGB print.

If starting from scratch it is always best to open a new Photoshop file in CMYK colour settings, but it is important to note that Photoshop is basically made for RGB screen work so RGB is the native setting and will have to be changed to fit print settings.

For the purposes of this exercise we were using a digital photo. As it is a digital photo, it will always be in RGB so it is a good point to work from when trying to change to CMYK.
The main problem with CMYK print is that it can not support anywhere near as many colours as RGB light can from a digital source. This means that you can have a really nice vibrant photography on screen but when it gets printed the colours become dull and it kind of ruins the photo.


Above is the original photography that we worked from. You can see that the colours are really vibrant and bright which will definitely be a problem; especially green which is a colour that CMYK struggles with quite a lot.

To see exactly how much of the image can't be supported by CMYK you can select the 'Gamut Warning' option shown here in the 'View' menu.
This simply changes the picture so that anything outside of the CMYK Gamut turns grey meaning that it can't be printed in CMYK and that it will come out as a different colour.
A Gamut basically just means a range, so it is true to say that the RGB gamut is greater than the CMYK gamut.







Below is the image showing the gamut warning. As you can see there is quite a lot of the sky and the grass which can't be printed in CMYK.
These bits will have to be edited to create colours which CMYK can support.
This picture shows that you can simply change the brightness and contrast or saturation to get the colours back in to the CMYK gamut.



You can also see what the image would like like if printed in CMYK by pressing this 'Proof Colours' Button in the same view toolbar. 
Pressing that makes the image look like this:
You can see that there isn't really a great amount of difference with this image but you also have to take into account that the screen will not show exactly what prints out either as the brightness and contrast settings are varied from computer to computer.

You can also change the image directly to CMYK by pressing the 'CMYK Colour' button in Image -> Mode which will literally just pull the RGB colours back into the CMYK gamut and try to get them as close as possible to what they would be on screen.

There isn't a great deal of difference in doing it this way, but by using the Gamut Warning selection and manually changing the brightness or contrast or saturation you get to have some more control over what the image looks like which is really useful.
If you want to paint onto the workspace yourself or colour things separately then you can use the colour mixer window to make sure that you always get a CMYK colour and this is the part of the window that is important. You can see the Current colour and the new colour that you are about to select but you can also see two other symbols on the right.

The bottom symbol is for web page colours but the top symbol lets you know if the colour is outside the printing gamut.


Here you can see that the purple colour is outside the CMYK gamut because the warning symbol has come up next to the current and new colours.
You can either manually choose a new colour or just click the warning sign and Photoshop will automatically switch it to the closest possible printable colour.
As you can see the colour is quite significantly different but unfortunately CMYK isn't very good for purples.
This is the closest colour you can print to the original on a conventional printer.

Above you can see the same picture in grayscale.
You can make the image duotoned which means it uses only 2 pantone colours but can create a lot of detail and give a nice effect.
This can be found under 'Mode' as well.




A new channel can also be added and assigned a Pantone colour.
This channel can then be made whatever size or shape needed and it can colour certain portions of the image which can also give a nice effect and would only need one more spot colour plate for commercial printing. 

After a bit of tweaking and editing the channel you can end up with a quite nice looking picture.