Editable layers Before working with the tools and other tools of Photoshop, you need to understand layers. Layers are the building blocks of all graphics in Photoshop and are used to construct and manipulate everything from simple designs to complicated composite images. Layers are used to define areas of an image that are transparent or not transparent. They are important for setting the overall effect of an image. They are also used to create special effects, such as backgrounds, transparency, and reflections. Most importantly, layers are the mechanism that enables you to create and work with complex layers that bring a final image together. Without layers, working with Photoshop would be difficult, if not impossible. Layers make it possible to create original image concepts and design them in various ways, apply visual effects, and adjust them to get the final image that you want. I talk more about working with layers and creating designs with layers in Book III, Chapter 4. Layers are also needed to use tools that create special effects. To create effects, you use tools that are accessible only to layers. Photoshop’s tools for creating special effects include the Brush tool, the Sponge tool, the Adjustment tool, and the Puppet Warp tool. Tools that change appearance of pixels (the Brush, Sponge, Adjustment, and Puppet Warp) are typically only available for layers, not for the entire canvas. To see how layers work and how you can use them to create complex effects, check out Chapter 4 of Book III.

Q: Mudança do css do input do tipo date Estou passando uma data para um input text e queria mudar de padrão, usando o data- e mudar as tralha’s dentro do input. Mas não consigo fazer. Queria que isso fosse: @date: ‘Mês de #{data}’; A: Você pode usar a propriedade CSS de data : input[type=”text”][data-pseudo], input[type=”email”][data-pseudo], input[type=”url”][data-pseudo], input[type=”search”][data-pseudo], input[type=”tel”][data-pseudo], input[type=”number”][data-pseudo] { background-image: url(“data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAAAwAAAAKCAYAAADhdO9IAAAAGT2lEQVR42u3VC3rdVi7rxK2K6HPR0VsH/TqEuzsTz1rcn2m2dZPjYhTaGX0NnHYpVM9PkS2bJEWU7qAqpJjOM1tU4U3XS5XhDF8fi5jQPY5IrkVfSigluXyB9cA27vWHhv25eD+mdyRP4hYK00z9jzDhtOAABC3G5NTKQELj8p6RhOQxBLbdJfX7nQAAAAAAAAAABAAACCLnVR1evSUZ3c4a8e3zDTbEXOTqY5G1zNTWOag2MnGGc9hjF4Fkep5IiJZd2gD37VAAQByN3iZ/lCIiB2qS8iKgjopE/E8ECIp+QAAiBVFx1X2qanRgAAAABJRU5ErkJggg==”);

Q: Reconstructing FFT and Inverse FFT for DFT EDIT: thanks for the replies. Maybe I was not precise enough with my question. I can easily reconstruct the FFT from DFT when I have the coefficients. (This is actually the case when I go through this chapter and the exercises). The case I care about is when I have the frequency bins, obtained from DFT. As I see it: 1) First case: I have the coefficients in px, but not the absolute values of the coefficients, i.e. the amplitude. 2) Second case: I have the amplitudes, so I can compute the inverse FFT and reconstruct the FFT. I don’t know if the amplitudes correspond to a spectrum, but if they do then this is easy. I have the question is: should I re-label the coefficients using “relative” values (I don’t know the amplitude), or should I write that the coefficient in px have x absolute value (so that the sum is equal to 1)? Thanks again. A: The FFT doesn’t care what units you’re using for your time domain signal so you shouldn’t be using relative units in your frequency domain. From the Direct Formulation of the DFT and Inverse DFT: Let X(k) be the sequence $$x(n) = \sum_{m=0}^{n-1} X(m) e^{ -j 2 \pi m k / N} \,, \quad n=1,\ldots,N-1$$ Then we have that $$X(n) = \frac{1}{N} \sum_{k=0}^{N-1} X(k) e^{ -j 2 \pi n k / N} = \frac{1}{N} \sum_{k=0}^{N-1} X\left(k \right) e^{ -j 2 \pi n k / N}$$ Therefore $$X(k) = \frac{1}{N} \sum_{n=0}^{N-1} X(n) e^{j 2 \pi n k / N} \,, \quad k=0,\ldots,N-1$$ Now we have that you already have the sequence \$X(