Digital art and photo editing use software tools to create, improve, and prepare images for sharing or printing. This cheat sheet helps students understand the basic choices that affect image quality, color, and workflow. It is useful for drawing, editing photos, making graphics, and exporting finished work.
Students can use it as a quick reference while working in apps like Photoshop, Photopea, Procreate, Krita, or Canva.
The most important ideas are layers, resolution, color modes, and file formats. Layers let artists separate parts of an image so they can edit without damaging the whole design. Resolution, measured in pixels or pixels per inch, controls how sharp an image looks on screens and in print.
Choosing the right tools, saving editable files, and exporting in the correct format helps artwork look polished and professional.
Key Facts
- Use layers to separate objects, text, effects, and background elements so each part can be edited independently.
- Resolution is image detail, and a common print setting is 300 PPI while screen images often use 72 to 144 PPI.
- Image size in pixels is found by width in pixels x height in pixels, such as 1920 x 1080 for a full HD image.
- RGB color mode is best for screens, while CMYK color mode is commonly used for professional printing.
- Save an editable master file in the program format, such as PSD, XCF, KRA, or Procreate, before exporting a flat final copy.
- Use PNG for transparent backgrounds or crisp graphics, JPEG for smaller photo files, and PDF for print-ready documents.
- Non-destructive editing means using adjustment layers, masks, and duplicate layers so the original image can be recovered.
- Cropping changes the edges of an image, while resizing changes the pixel dimensions or print dimensions of the image.
Vocabulary
- Layer
- A layer is a separate level in a digital image that can hold artwork, text, effects, or adjustments.
- Resolution
- Resolution is the amount of detail in an image, usually measured in pixels or pixels per inch.
- Pixel
- A pixel is the smallest square unit of color that makes up a digital image on a screen.
- Selection
- A selection is an active area of an image that can be edited without changing the rest of the image.
- Mask
- A mask hides or reveals parts of a layer without permanently erasing the image.
- Export
- Export means saving a finished copy of a project in a format that is easy to share, print, or upload.
Common Mistakes to Avoid
- Working directly on the original image is a mistake because it can permanently damage the only copy. Duplicate the layer or use adjustment layers before making major edits.
- Using low-resolution images for print is a mistake because they can look blurry or pixelated on paper. Use higher pixel dimensions or about 300 PPI for printed work.
- Flattening layers too early is a mistake because it removes the ability to edit separate parts later. Save a layered master file before making a flat export.
- Choosing the wrong file format is a mistake because each format has a different purpose. Use PNG for transparency, JPEG for small photo files, and editable project formats for ongoing work.
- Overusing filters and effects is a mistake because it can make the artwork look messy or distract from the main subject. Apply effects with a clear purpose and compare before and after versions.
Practice Questions
- 1 A student creates an image that is 1200 pixels wide and 800 pixels tall. How many total pixels are in the image?
- 2 A poster must print at 8 inches wide with a resolution of 300 PPI. What pixel width should the file be?
- 3 You need to export a logo with a transparent background for a website. Which file format is usually the best choice, PNG or JPEG?
- 4 Explain why using layers and masks is better than erasing parts of the original photo when editing.
Understanding Digital Art & Photo Editing Basics
A digital image is built from tiny colored squares called pixels. When an image is enlarged beyond the detail it contains, those squares become visible and edges look blocky. This is why a small image copied from a website may look acceptable on a phone yet fail when placed on a poster.
Print size depends on how closely the pixels are packed. An image that is 2400 pixels wide can print about eight inches wide at 300 pixels per inch. Cropping can improve composition, but it removes pixels from the edges.
Enlarging after a heavy crop cannot truly restore missing detail. Software may smooth the result, but smoothing is not the same as recovering information.
Color is created differently by light and ink. A screen adds red, green, and blue light to make bright colors. Printed ink absorbs light from paper, so some intense screen colors cannot be reproduced exactly in print.
Bright neon greens and saturated blues are common trouble spots. A design can therefore look different on a classroom monitor, a home printer, and a professionally printed page. Artists should inspect important colors before final printing, especially skin tones, dark shadows, and text placed over colored backgrounds.
Color profiles help devices interpret color consistently. They reduce surprises, though they cannot make every screen or printer identical.
Layers work best when they are organized like parts of a physical collage. Give layers useful names, group related parts, and keep the background separate from the main subject. The order matters because a layer higher in the stack can cover one below it.
Opacity controls how much of a layer shows through. Blend modes change how a layer’s colors interact with nearby colors, which can create shadows, highlights, or textures. Selection tools define a temporary area for editing.
A clean selection is important when replacing a sky or changing the color of one object. Masks are often safer than erasing because black on a mask hides an area while white reveals it again. This method supports experimentation without permanent loss.
A careful workflow prevents common mistakes. Make major edits on copies or adjustment layers, then compare the edited version with the original. Zoom in to check edges, but zoom out often to judge the overall composition.
Text must be large enough to read at its final viewing size, not only while it is enlarged on the screen. Before exporting, check spelling, alignment, unwanted transparent gaps, and image dimensions. Keep the editable source file because a teacher, client, or future project may require changes later.
The exported file is a delivery copy, not a replacement for the working file. These habits reflect how photographers, illustrators, designers, and museum digitization teams preserve visual work while preparing it for different uses.