Photoshop Intro Course: Intro to Layers

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Video Transcription

In this tutorial, we'll explore layers—one of Photoshop's most fundamental and powerful features. Understanding layers is crucial for professional, non-destructive editing workflows. Let me demonstrate by using the paintbrush tool to make some initial marks on this document. I'll drag out a red mark here, which appears on the background layer. You'll find the Layers panel positioned in the bottom right corner of your interface.

If you're using Photoshop's default Essentials workspace, this panel should be visible and accessible in the bottom right. If it's not visible, you may have switched to a different panel—simply click back to the Layers tab. Should the panel be entirely closed, you can always access it through the Window menu. This panel is your command center for managing all layer operations.

The background layer appears automatically in most files, particularly when opening photographs. This is a special type of layer with unique properties that we'll explore shortly. But first, let's understand what a layer actually is: essentially, it's a container for storing pixels—the building blocks of digital images.

When I zoom in closer using the zoom tool, you can see individual pixels that comprise our image. I'll turn off the pixel grid by navigating to View > Show and disabling it for clarity. Each individual colored pixel combines with others to create what appears as a cohesive photograph or graphic when viewed at normal magnification. This pixel-based foundation is how Photoshop processes all imagery—every element breaks down into these discrete color units.

Here's the key principle: each layer contains one set of pixels, and each pixel can only remember one color at a time. If you want to preserve different color information or create variations, you need additional layers. Working on the current layer means you're limited to one pixel set. When I change those pixel colors—say, switching my paintbrush to black and painting over the red marks—I'm permanently altering those pixels. The previous color information is gone.

This is critical to understand: if I save and close this file, there's no memory of the original colors because everything happened on the background layer. The pixels don't remember what was "behind" them—there is no behind. I've literally changed their color values. Photoshop's History panel provides temporary undo functionality, but this isn't stored with your file and disappears when you close the document.

History is limited by default to 50 states, though you can adjust this in Preferences. Access this through Edit > Preferences on Windows or Photoshop > Preferences on Mac, then navigate to Performance settings. Remember: history isn't permanent and resets to just "Open" each time you launch a file. For maintaining true editability and preserving information in your files, layers are essential—not the history panel.

Let me demonstrate the power of layers with a practical example. Rather than destructively editing, I'll create a new layer by clicking the new layer button at the bottom of the Layers panel. Think of this layer as a transparent sheet of glass positioned above your photograph. When I paint white on this layer, it covers the pomegranate seeds beneath, but the original remains intact and accessible.

Watch how layer visibility works: I can hide this layer to reveal the original image underneath. If I hide the background layer, only the white pixels I painted are visible—everything else is transparent. This demonstrates layers' fundamental concept: they stack vertically, with upper layers appearing in front of lower ones.

Let me create multiple layers to illustrate this stacking order. I'll name this first layer "white remove seeds," then create another layer for red paint, sampling color from the pomegranates themselves. This red mark exists independently on its own layer. The stacking order matters: if I place the white layer above the red, the white pixels mask what's below.

Adding a third layer with black marks further demonstrates this hierarchy. I'll reset to default colors (black foreground, white background) and paint some black marks. Now I have three distinct layers that I can rearrange, hide, or show independently. The topmost layer appears in front, while the bottom layer (our background) sits in back—hence the name "background layer."

This flexibility is transformative for professional workflows. I can rearrange these layers at any time, toggle their visibility, and when I hide all added layers, the original pomegranate image remains untouched. Each layer maintains its independence—using the Move tool, I can reposition the red marks, white marks, or black marks separately without affecting the others.

This layer-based approach builds true editability into your documents, enabling you to return days, weeks, or months later with full flexibility intact. However, layers are only preserved when saving in compatible file formats. JPEGs, for instance, don't support layers and will flatten your image. For editable documents that preserve layers, save as Photoshop (.PSD) files.

I'm going to save this as 'Dan Pomegranate' in Photoshop format because PSD files maintain complete layer information. When the compatibility dialog appears, always choose "Maximize Compatibility"—this ensures your files work seamlessly with other Adobe applications like InDesign, After Effects, and Premiere Pro, as well as different Photoshop versions. Select "Don't show again" to streamline future saves.

Saving as a Photoshop file preserves all layer information permanently. Unlike history, which vanishes when you close a file, layers remain intact when you reopen your document. This persistence comes with increased file sizes, but the flexibility gain far outweighs storage concerns for professional work. If you decide later that you don't want a particular edit—say, removing that seed—simply delete the layer and the original element returns instantly.

Understanding the background layer's unique properties is crucial for professional workflows. When you use the eraser tool on the background layer, it doesn't create transparency—instead, it "erases" to your current background color. If your background color is blue, erasing effectively paints with blue. Similarly, painting with the paintbrush applies your foreground color. All these operations happen directly on the background layer, meaning you're working destructively, permanently altering pixel colors.

For non-destructive editing, perform these operations on separate layers instead. You can convert the background layer to a regular layer by clicking the lock icon or double-clicking the layer name. Once converted, it supports transparency, and the eraser tool creates genuine transparency rather than painting with the background color. This transparency proves valuable when importing images into other Adobe applications or preparing graphics for web use where background transparency is desired.

Remember: you can only have one background layer per file, while you can create unlimited regular layers. Layers also come into play automatically with copy and paste operations. Let me demonstrate using the rectangular marquee tool to select an area for copying. Notice my Layers panel currently shows only the background layer. When I go to Edit > Paste, Photoshop automatically creates a new layer for the pasted content.

Since I maintained the selection during copying, the pasted content appears in the same location initially. However, using the Move tool reveals that I've created an independent copy of that pomegranate seed that can be repositioned freely. Double-clicking the layer name allows me to provide descriptive names—essential for organizing complex projects with multiple layers.

This layer-based approach offers tremendous flexibility: I can temporarily hide elements while keeping them in the file for potential future use, or permanently delete layers by dragging them to the trash icon. Note that Photoshop's trash doesn't function like your operating system's—once deleted, layers are gone permanently without recovery options. Alternatively, select a layer and press Delete on your keyboard for quick removal.

The Clone Stamp tool provides another method for creating copies, though it operates differently from copy-paste. The Clone Stamp combines copying and painting into a single tool, requiring two distinct steps: first, define your source by Option-clicking (Mac) or Alt-clicking (Windows) on the area you want to copy. Then, paint with that sampled content wherever needed. You'll see a preview crosshair showing your brush size and the source location as you work.

By default, the Clone Stamp works on the current layer, but you can modify this behavior. The Sample dropdown offers options: "Current Layer" samples only the active layer, "Current & Below" samples the current layer plus all layers beneath it, and "All Layers" samples everything visible. "Current & Below" often provides the best results for most retouching scenarios, as it avoids sampling from layers you might want to keep separate.

For non-destructive retouching workflows, create a dedicated layer for your clone stamp work. This approach preserves your original image while building edits on separate layers. You can name this layer descriptively—perhaps "Retouching"—and perform all your cleanup work there. This method maintains complete editability: you can hide the retouching layer to see the original, modify opacity for subtle effects, or delete it entirely if you change direction.

The power of this layer-based approach becomes evident when you hide the background layer and see only your retouching work isolated. This separation is fundamental to professional Photoshop workflows and forms the foundation for all advanced techniques. Layers represent one of Photoshop's most powerful features, and mastering them early will dramatically improve both your efficiency and creative possibilities. This introduction covers the essential concepts, but we'll explore advanced layer techniques and professional applications in subsequent tutorials.