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Introducción a Adobe Photoshop 3: Guía para Principiantes

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Introducción a Adobe Photoshop 3: Guía para Principiantes

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Una introducción completa a la interfaz de usuario de Photoshop 3, herramientas básicas y conceptos fundamentales para principiantes.

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Layers are like clear sheets you can lay over background layers or images. Working in layers allows you to add and adjust different elements like portions of photos or text. If your layer is transparent or semi-transparent, you can see through it to the layers below it.

You can add images, textures, colors, and text to one layer without affecting the content in the layers below it, so you can undo or adjust any moves you make that you're not happy with. Create a new layer from scratch or create one from an existing image.

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How to use Photoshop for beginners - learn the basics - Adobe

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Explore this beginners' guide for everything you need to know to start using Adobe Photoshop. Learn the basics like layers, masking, drawing, and more.

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Explicación detallada de las herramientas principales y funciones básicas de Photoshop 3, incluyendo capas, selecciones y ajustes de imagen.

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Explicación de los diferentes formatos de archivo compatibles con Photoshop 3 y cuándo usar cada uno.

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Tutoriales de Photoshop 3: Primeros Pasos

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Tutoriales de Photoshop 3: Primeros Pasos

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Serie de tutoriales paso a paso que cubren las operaciones básicas en Photoshop 3, desde abrir archivos hasta guardar en diferentes formatos.

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Guía de Herramientas de Selección en Photoshop 3

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Guía de Herramientas de Selección en Photoshop 3

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Descripción detallada de las diferentes herramientas de selección disponibles en Photoshop 3 y cuándo usar cada una.

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Learn the basics of the selection tools in Adobe Photoshop, including how to use the Marquee, Quick Select, and Lasso tools.

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Explicación completa del sistema de capas en Photoshop 3, incluyendo crear, combinar y ajustar capas.

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When you create a new image with a white background or a colored background, the bottommost image in the Layers panel is called Background. An image can have only one background layer. You cannot change the stacking order of a background layer, its blending mode, or its opacity. However, you can convert a background into a regular layer, and then change any of these attributes.

When you create a new image with transparent content, the image does not have a background layer. The bottommost layer is not constrained like the background layer; you can move it anywhere in the Layers panel and change its opacity and blending mode.

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Learn the basics of working with Adobe Photoshop layers. You can use layers in Adobe Photoshop to combine (or composite) multiple images, add text to an image, add vector graphic shapes, add special effects such as a drop shadow or a glow, and more.

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Guía sobre cómo realizar ajustes básicos de color, brillo, contraste y saturación en Photoshop 3.

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Atajos de Teclado Esenciales para Photoshop 3

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Atajos de Teclado Esenciales para Photoshop 3

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Compilación de los atajos de teclado más útiles para aumentar la productividad en Photoshop 3.

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Quick tips to remember:

You can customize the keyboard shortcuts in Photoshop on the desktop. See Customize keyboard shortcuts.

You can view, edit, and summarize keyboard shortcuts in the Keyboard Shortcuts dialog box. To view this in Photoshop, select Edit > Keyboard Shortcuts or use the following keyboard shortcuts:

On newer MacBook Pro models, the Touch Bar replaces the function keys on top of the keyboard. See this Apple documentation article to understand how to use the function keys on these models.

You can take a look at the keyboard shortcuts for Photoshop on the web beta: Keyboard shortcuts | Photoshop on the web.

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Use keyboard shortcuts to become more productive while using Adobe Photoshop.

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Guía sobre cómo trabajar con resolución y tamaño de imagen en Photoshop 3, incluyendo conceptos básicos de píxeles y DPI.

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Note:

Photoshop has an updated Image Size dialog box. See Resizing images for more information.

Unless an image is resampled (see Resampling), the amount of image data remains constant as you change either the print dimensions or resolution. For example, if you change the resolution of a file, its width and height change accordingly to maintain the same amount of image data.

In Photoshop, you can see the relationship between image size and resolution in the Image Size dialog box (choose Image > Image Size). Deselect Resample Image, because you don't want to change the amount of image data in your photo. Then change width, height, or resolution. As you change one value, the other two values change accordingly. With the Resample Image option selected, you can change the resolution, width, and height of the image to suit your printing or onscreen needs.

A. Original dimensions and resolution B. Decreasing the resolution without changing pixel dimensions (no resampling)C. Decreasing the resolution at same document size decreases pixel dimensions (resampling).

The file size of an image is the digital size of the image file, measured in kilobytes (K), megabytes (MB), or gigabytes (GB). File size is proportional to the pixel dimensions of the image. Images with more pixels may produce more detail at a given printed size, but they require more disk space to store and may be slower to edit and print. Image resolution thus becomes a compromise between image quality (capturing all the data you need) and file size.

Another factor that affects file size is file format. Because of the varying compression methods used by GIF, JPEG, PNG, and TIFF file formats, file sizes can vary considerably for the same pixel dimensions. Similarly, color bit-depth and the number of layers and channels in an image affect file size.

Photoshop supports a maximum pixel dimension of 300,000 by 300,000 pixels per image. This restriction places limits on the print size and resolution available to an image.

Printer resolution is measured in ink dots per inch, also known as dpi. Generally, the more dots per inch, the finer the printed output you'll get. Most inkjet printers have a resolution of approximately 720 to 2880 dpi. (Technically, inkjet printers produce a microscopic spray of ink, not actual dots like imagesetters or laser printers.)

Printer resolution is different from, but related to image resolution. To print a high quality photo on an inkjet printer, an image resolution of at least 220 ppi should provide good results.

Screen frequency is the number of printer dots or halftone cells per inch used to print grayscale images or color separations. Also known as screen ruling or line screen, screen frequency is measured in lines per inch (lpi)-or lines of cells per inch in a halftone screen. The higher the resolution of the output device, the finer (higher) a screen ruling you can use.

The relationship between image resolution and screen frequency determines the quality of detail in the printed image. To produce a halftone image of the highest quality, you generally use an image resolution that is from 1.5 to at most 2 times the screen frequency. But with some images and output devices, a lower resolution can produce good results. To determine your printer's screen frequency, check your printer documentation or consult your service provider.

Note:

Some imagesetters and 600‑dpi laser printers use screening technologies other than halftoning. If you are printing an image on a nonhalftone printer, consult your service provider or your printer documentation for the recommended image resolutions.

A. 65 lpi: Coarse screen typically used to print newsletters and grocery couponsB. 85 lpi: Average screen typically used to print newspapersC. 133 lpi: High-quality screen typically used to print four-color magazinesD. 177 lpi: Very fine screen typically used for annual reports and images in art books

Note:

If your image resolution is more than 2.5 times the screen ruling, an alert message appears when you try to print the image. This means that the image resolution is higher than necessary for the printer. Save a copy of the file, and then reduce the resolution.

For Quality, select an option:

Produces a resolution that is the same as the screen frequency (no lower than 72 pixels per inch).

Produces a resolution 1.5 times the screen frequency.

Produces a resolution 2 times the screen frequency.

The image is redisplayed in its approximate printed size, as specified in the Document Size area of the Image Size dialog box. The size and resolution of your monitor affect the on‑screen print size.

Note:

The Print Size command is not available in the Creative Cloud version.

Resampling is changing the amount of image data as you change either the pixel dimensions or the resolution of an image. When you downsample (decrease the number of pixels), information is deleted from the image. When you resample up (increase the number of pixels, or upsample), new pixels are added. You specify an interpolation method to determine how pixels are added or deleted.

A. Downsampled B. Original C. Resampled up (selected pixels displayed for each set of images)

Keep in mind that resampling can result in poorer image quality. For example, when you resample an image to larger pixel dimensions, the image loses some detail and sharpness. Applying the Unsharp Mask filter to a resampled image can help refocus the image details.

You can avoid the need for resampling by scanning or creating the image at a sufficiently high resolution. If you want to preview the effects of changing pixel dimensions on‑screen or to print proofs at different resolutions, resample a duplicate of your file.

Photoshop resamples images using an interpolation method to assign color values to any new pixels based on the color values of existing pixels. You can choose which method to use in the Image Size dialog box.

Note:

You can specify a default interpolation method to use whenever Photoshop resamples image data. Choose Edit > Preferences > General (Windows) or Photoshop > Preferences > General (Mac OS), and then choose a method from the Image Interpolation Methods menu.

When you finish setting options, click OK.

Note:

For best results when you produce a smaller image, downsample and apply the Unsharp Mask filter. To produce a larger image, rescan the image at a higher resolution.

When creating an image for print media, it's useful to specify image size in terms of the printed dimensions and the image resolution. These two measurements, referred to as the document size, determine the total pixel count and therefore the file size of the image; document size also determines the base size at which an image is placed into another application. You can further manipulate the scale of the printed image using the Print command; however, changes you make using the Print command affect only the printed image, not the document size of the image file.

If you turn on resampling for the image, you can change print dimensions and resolution independently (and change the total number of pixels in the image). If you turn off resampling, you can change either the dimensions or the resolution-Photoshop adjusts the other value automatically to preserve the total pixel count. For the highest print quality, it's generally best to change the dimensions and resolution first, without resampling. Then resample only as necessary.

Change the print dimensions, image resolution, or both:

To change only the print dimensions or only the resolution and adjust the total number of pixels in the image proportionately, select Resample Image and then choose an interpolation method.

To change the print dimensions and resolution without changing the total number of pixels in the image, deselect Resample Image.

For Resolution, enter a new value. If desired, choose a new unit of measurement.

Note:

To restore the initial values displayed in the Image Size dialog box, hold down Alt (Windows) or Option (Mac OS), and click Reset.

File size depends on the pixel dimensions of an image and the number of layers it contains. Images with more pixels may produce more detail when printed, but they require more disk space to store and may be slower to edit and print. You should keep track of your file sizes to make sure the files are not becoming too large for your purposes. If the file is becoming too large, reduce the number of layers in the image or change the image size.

You can view the file size information for an image at the bottom of the application window.

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Note: Photoshop has an updated Image Size dialog box. See Resizing images for more information. Unless an image is resampled (see Resampling), the amount of image data remains constant as you change either the print dimensions or resolution. For example, if you change the resolution of a file, its width and height change accordingly to maintain the same amount of image data.

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Introducción a los efectos y filtros más comunes en Photoshop 3, con ejemplos prácticos de aplicación.