Wet Plate Collodion Research Task
*Wet plate collodion process*
This is a photographic process that was invented in 1851 by Frederick Scott Archer and by the end of 1860 had almost entirely replaced the first announced photographic process, the daguerreotype. The collodion process involves the photographic material to be coated, exposed and developed within the span of fifteen minutes. There was a number of manual steps involving cutting the glass or metal plate; wiping egg-white along its edges; coating it evenly with a syrupy substance called collodion; making it light-sensitive by dunking it in silver nitrate for a few minutes; loading the wet plate carefully into a “dark slide” which is inserted into the camera; taking the picture; then developing it, which is rather like processing black and white print. Photographers from the 19th century had to take chemistry labs with them everywhere, in black tents. There are a lot of steps and many of these can easily go wrong.
*What does the channel mixer do?*
The channel mixer is a tool in photoshop that allows the user to mix different colour channels mainly consisting of RGBA (Red, Green, Blue, Alpha).This features allows you to repair channels and produce grayscale images from colour images. You can also create tinted images and special effects.
*What are blending modes?*
Blending modes in photoshop are used to determine how layers can be lapped on two each other until they are mixed together and submerged. It can achieve a realistic and natural look to the brush strokes. The tool allow you to blend and vary your wetness within a single brush stroke. You can also choose your desired foreground colour from the tools panel.
Normal - “Normal” is the default Blending Mode for Photoshop layers. Opaque pixels will cover the pixels directly below them without applying any math or algorithm applied to them. You can, of course, reduce the opacity of the layer to reveal the pixels below.
Darken - The result darkens the image. White is invisible on the Blend layer.
Dissolve - The dissolve mode takes random pixels from both layers. With top layer opacity greater than that of the bottom layer, most pixels are taken from the top layer, while with low opacity most pixels are taken from the bottom layer.
Multiply - Multiply blend mode multiplies the RGB channel numbers for each pixel from the top layer with the values for the corresponding pixel from the bottom layer. The result is always a darker picture; since each value is less than 1, their product will be less than either of the initial values.
Colour burn - The Colour Burn Blending Mode gives you a darker result than Multiply by increasing the contrast between the base and the blend colours resulting in more highly saturated mid-tones and reduced highlights. The result is very similar to the effect you would get when you use the Burn Tool to darken an image.
Linear Burn - Linear Burn decreases the brightness of the base colour based on the value of the blend colour. The result is darker than Multiply but less saturated than Colour Burn. Linear Burn also produces the most contrast in darker colours than any of the other Blending Modes in the Darker group.
Darker Colour - Photoshop checks to see if the colours are darker than 50% grey or lighter than 50% grey. If the colours are darker than 50% grey, a darkening Blending Mode is applied. If the colours are brighter than 50% grey, a brightening Blending Mode is applied.
Lighter Colour - The opposite blend mode to Darken is Lighten, and with the Lighten blend mode, if the pixels on the active layer are lighter than the ones on the layers below, they are kept in the image.
Screen - The Screen blend mode works exactly the opposite. With Screen, anything on the layer that's pure black will disappear from view. Anything that's pure white will remain unchanged, and any shade of grey between pure black and pure white will become lighter.
Colour dodge - The Colour Dodge blend mode divides the bottom layer by the inverted top layer. This lightens the bottom layer depending on the value of the top layer: the brighter the top layer, the more its colour affects the bottom layer. Blending any colour with white gives white. Blending with black does not change the image.
Linear dodge - This Blending Mode looks at the colour information in each channel and brightens the base colour to reflect the blend colour by increasing the brightness. Blending with black produces no change.
Soft light - In the case of the Soft Light blending mode it is similar to using the dodge or burn tool. In other words, every colour that is lighter than 50% grey will get even lighter, like it would if you shine a soft spotlight to it. In the same way, every colour darker than 50% grey will get even darker.
Hard light - “Multiplies or screens the resulting colour depending on the original colour. If underlying colour is less than 50% grey, the layer lightens it as if it were screened. If underlying colour is greater than 50% grey, the layer darkens it it as if it were multiplied.”
Vivid light - The Vivid Light Blend mode is a mixture of Colour Burn and Colour Dodge and interacts with your image differently based on the selected layer. Because Vivid Light uses Colour Burn and Colour Dodge as its base, it makes for some beautiful colour graded images.
Linear light - The Linear Light blending mode is a combination of Linear Burn and Linear Dodge — but similar to Vivid Light, the combination gives slightly different results. … Linear Light: Burns or dodges the colours by decreasing or increasing the brightness, depending on the blend colour.
Pin light - Photoshop defines this blend modes function as, … “Pin Light replaces the colours, depending on the blend colour. If the blend colour (light source) is lighter than 50% grey, pixels darker than the blend colour are replaced, and pixels lighter than the blend colour do not change
Difference - One of the fastest ways to get amazing looking images is by using Blending modes. Each blending mode changes the way that a layer reacts with the layer underneath it. You get a small inkling of this by adjusting the opacity of a layer. Using blending modes opens up an entirely new world
Hue - The Hue Blend mode is pretty straightforward: Hue Mode: Creates a result colour with the luminance and saturation of the base colour and the hue of the blend colour. … Setting a new, blank layer to “Hue” means that you can “paint over” any part of your image and change the colour.
Saturation - The Saturation blend mode preserves the luma and hue of the bottom layer, while adopting the chroma of the top layer. The Colour blend mode preserves the luma of the bottom layer, while adopting the hue and chroma of the top layer.
Overlay - Blend modes (or mixing modes) in digital image editing and computer graphics are used to determine how two layers are blended with each other. The default blend mode in most applications is simply to obscure the lower layer by covering it with whatever is present in the top layer (see alpha compositing).
*Explain what layers and masks are*
Layers control the transparency of the layer which is on top, the areas of a layer that are hidden by a layer mask actually becomes transparent allowing image information from lower layers to show through. Layer masks are greyscale so you cant add colours.
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