Your Guide to Colour Separating for Custom T-Shirt Printing - PowerPoint PPT Presentation

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Your Guide to Colour Separating for Custom T-Shirt Printing

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Screen printers are usually given very low-resolution and low-quality pictures and designs downloaded directly from websites for production. These images are, however, not sufficient for direct reproduction because web graphics are designed to be a size as small of a file size as possible. The reason for this is that this way, the web page, the images are lifted from, has a faster loading speed. Such images are then more than often have to re-drawn with the help of a vector program, for example, Adobe Illustrator or similar software. Or they are exposed to a number of Photoshop filters in order to try to enhance them, or sometimes both. – PowerPoint PPT presentation

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Title: Your Guide to Colour Separating for Custom T-Shirt Printing


1
Your Guide to Colour Separating for Custom
T-Shirt Printing
  • DTG PRINTING
  • PRINTING
  • SCREEN PRINTING

2
  • When to use what type of colour separation when
    custom printing t-shirts.
  • Printing onto T-shirts via the old school screen
    printing method is not always simple and
    straightforward. The process to make the decision
    involves variables that determine the approach
    you take when it comes to custom printing clothes
    such as t-shirts. So, before you decide what
    process you want to use, you need to know about
    the variables

3
  • The first variable in the list is the picture
    itself and the way it will get separated before
    it is sent to the screen room. The artwork or
    design you create is made with fundamental
    variable building blocks that are the reason why
    you have to consider how you will screen print
    your design
  • Is it a bitmap or a vector file format?
  • Is the resolution of your design or artwork good
    enough to start the process with?
  • Your artwork will have either one or more than
    one colour. Decide how many colours are too many?
  • The object in the design, artwork, or logo may
    contain gradients, tonal changes, or solid spot
    colours. The artwork can have text too. So, the
    size of the artwork is crucial to the process.
    Similarly, the thickness of the key lines, if
    your design has any, is important to be
    considered as well. 
  • What colour garments or fabric are you printing
    your artwork on?

4
  • Many customers, however, will not take into
    consideration that so many factors are required
    when assessing artwork and designs. If they end
    up getting a graphic designer to produce their
    design or artwork who is t-shirt trained, then
    the graphic designer will consider all the
    above-stated factors because of his/her prior
    knowledge and expertise in the field.
  • Screen printers are usually given very
    low-resolution and low-quality pictures and
    designs downloaded directly from websites for
    production. These images are, however, not
    sufficient for direct reproduction because web
    graphics are designed to be a size as small of a
    file size as possible. The reason for this is
    that this way, the web page, the images are
    lifted from, has a faster loading speed.
  • Suggested Read Digital Printing vs Embroidery
    Which Is the Right One for Your Workwear?
  • Such images are then more than often have to
    re-drawn with the help of a vector program, for
    example, Adobe Illustrator or similar software.
    Or they are exposed to a number of Photoshop
    filters in order to try to enhance them, or
    sometimes both. 
  • Assuming your design or artwork is the best it
    can be, there are several colour separation
    techniques that you can use

5
Spot Colour Separations
  • Spot colour separation is the most often used and
    the most basic method of colour separation. It is
    used when the artwork is made using solid colours
    that do not have intricate photo-realistic colour
    variations or tonal variations also referred to
    as gradients. You can do these with software such
    as Adobe Illustrator or Adobe Photoshop. The idea
    behind this is that every colour is lifted from
    the artwork, placed into its own separate layer
    within the layer palette of the adobe program
    that you have used, converted into a black
    infill, and then finally labelled with the
    registration marks and colour information before
    they get printed onto acetate film or for the
    screen room. The best part is that every colour
    fits snugly and perfectly next to the other
    colours you have used with no overlap.

6
Process Colour Separations
  • This type of printing requires four colours to
    make multi-coloured designs with hundreds of
    colours. Process printing is usually referred to
    as CMYK printing with the letters representing
    Cyan, Magenta, Yellow and Key. All the pictures
    that you see in magazines are printed using this
    type of printing, and you can even see a variable
    pattern of small dots if you hold a magnifying
    glass up to these pictures.
  • The resolutions that are achieved using modern
    digital paper printing presses are much better
    than the resolution achieved using screen
    printing. Plus, these dots are also difficult to
    spot with the naked eye in a magazine, however,
    they can be easily seen on a t-shirt. The reason
    for this is that the output resolution to the
    film needed to burn a screen cant be more than
    65 dpi or LPI. This depends on the restrictive
    capabilities of the processes and chemicals
    employed in screen making for screen printing.

7
  • Process separations work incredibly well with
    white T-shirts, but they do not do well with dark
    t-shirts. The reason for this is that the process
    inks used for this procedure are a little
    transparent and the colour of a shirt that is
    darker will show through the ink printed on it
    and will affect the print colour. You can also
    try printing a white base under process inks, but
    you may get a washed out colour effect as a
    result, which will prevent your final image from
    looking the way you want it to. You can also
    augment process printing via spot colour printed
    in a halftone, so it can fit in the dot
    configuration of the process separations.
    Furthermore, you can never get Pantone accurate
    colours by using process printing. Plus, the
    majority of the skills in making a good print
    depend on the printer who is responsible for
    setting the job up, on the press along with good
    separations delivered by the artwork department.
  • These separations are printed on a high mesh
    count screen. The screen is designed specially to
    hold detail. Typically, mesh counts of 90 holes
    per inch up to 140 holes per inch are preferred
    for this.

8
Simulated Process Printing
  • This process uses spot colours output to
    halftones similar to how the CMYK halftones are
    rendered.
  • This is considered a better option than CMYK
    separations for complex, tonally rich t-shirt
    printed graphics as it produces bright, vivid
    colours regardless of the t-shirt colour. A white
    under-base is required along with experience and
    skills to understand the process and separate
    correctly. Photorealistic images can be achieved
    with this process which can sometimes be called
    channel or tonal separations.
  • These separations are printed on high mesh count
    screens that are designed to hold detail. Mesh
    counts of 90 holes per inch up to 140 holes per
    inch are typically used.

9
Index Colour Separations
  • These are also known as diffusion, dither, or
    stochastic. This type of method uses tiny
    randomly spaced squares instead of ellipses or
    dots to make the tonal variations. The small
    squares are printed next to one another instead
    of overlapping like simulated or process, process
    printing. As a result, you get a jigsaw effect
    which results in tonal variations.
  • If you look at it closely, you can spot that the
    image has a posterised look which cannot be
    seen if you move away. The human eye cannot
    usually detect this effect and, so the image
    appears tonal and variable.

10
When To Use What Spot Colour Separation?
(Conclusion)
  • Spot colour separations vary depending on the
    design since the majority of artworks are solid
    coloured images or consist of simple text. When
    you are working with a variable and tonally rich
    design, then you will have to go with simulated
    process printing. The only limitations to this
    method are budgetary.
  • If you have a budget that lets you use only 4
    colours, and you are working with white t-shirts,
    then CMYK is your best fit.
  • If the design you are working with is tonally
    variable but also has a high contrast effect
    requirement, then you may have to go with INDEX.
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