PIL cannot write mode F to jpeg

I am taking a jpg image and using numpy’s fft2 to create/save a new image. However it throws this error “IOError: cannot write mode F as JPEG” Is there an issue with CMYK and JPEG files in PIL??? p = Image.open(‘kibera.jpg’) bw_p = p.convert(‘L’) array_p = numpy.asarray(bw_p) fft_p = abs(numpy.fft.rfft2(array_p)) new_p = Image.fromarray(fft_p) new_p.save(‘kibera0.jpg’) new_p.histogram() … Read more

Get cart item name, quantity all details woocommerce

I am trying to send the woocommerce cart items to third party shipping tool. I need the item name, quantity and individual price to be sent to the third party. How can this be achieved? $items = $woocommerce->cart->get_cart(); foreach($items as $item => $values) { $_product = $values[‘data’]->post; echo $_product->post_title; } How do I get item … Read more

What is the difference between numpy.fft and scipy.fftpack?

Is the later just a synonym of the former, or are they two different implementations of FFT? Which one is better? Answer SciPy does more: http://docs.scipy.org/doc/numpy/reference/routines.fft.html http://docs.scipy.org/doc/scipy/reference/fftpack.html# In addition, SciPy exports some of the NumPy features through its own interface, for example if you execute scipy.fftpack.helper.fftfreq and numpy.fft.helper.fftfreq you’re actually running the same code. However, … Read more

Get WooCommerce product categories from WordPress

I am trying to get the product categories from WooCommerce through a function in my WordPress theme function get_me_list_of($atts, $content = null) { $args = array( ‘post_type’ => ‘product’, ‘posts_per_page’ => 10, ‘product_cat’ => $atts[0]); $loop = new WP_Query( $args ); echo ‘<h1 class=”upp”>Style ‘.$atts[0].'</h1>’; echo “<ul class=’mylisting’>”; while ( $loop->have_posts() ) : $loop->the_post(); global … Read more

Units of a Fourier Transform (FFT) when doing Spectral Analysis of a Signal

My question has to do with the physical meaning of the results of doing a spectral analysis of a signal, or of throwing the signal into an FFT and interpreting what comes out using a suitable numerical package, Specifically: take a signal, say a time-varying voltage v(t) throw it into an FFT (you get back … Read more

WooCommerce: Finding the products in database

I’m creating a website using WooCommerce and I want to restrict the available products to users depending on the postcode that they enter in the search form on my home page. To be able to achieve that I’ll have to specify the conditions of each product within the database in phpMyAdmin, but I can’t seem … Read more

An implementation of the fast Fourier transform (FFT) in C# [closed]

Closed. This question does not meet Stack Overflow guidelines. It is not currently accepting answers. Want to improve this question? Update the question so it’s on-topic for Stack Overflow. Closed 5 years ago. Improve this question Where can I find a free, very quick, and reliable implementation of FFT in C#? That can be used … Read more

Why does FFT produce complex numbers instead of real numbers?

All the FFT implementations we have come across result in complex values (with real and imaginary parts), even if the input to the algorithm was a discrete set of real numbers (integers). Is it not possible to represent frequency domain in terms of real numbers only? Answer The FFT is fundamentally a change of basis. … Read more